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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfers out of Level 3 $ 5.7 $ 0.0 $ 5.7 $ 0.6  
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 7,218.8   7,218.8   $ 7,986.9
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 395.0   395.0   830.6
Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total 7,657.3   7,657.3   8,863.9
Convertible debt at fair value 43.5   43.5   46.4
Fair Value, Measurements, Recurring | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total 271.9   271.9   325.0
Convertible debt at fair value 0.0   0.0   0.0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total 191.3   191.3   251.4
Convertible debt at fair value 0.0   0.0   0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total 198.9   198.9   586.6
Convertible debt at fair value 0.0   0.0   0.0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total 6,995.2   6,995.2   7,700.9
Convertible debt at fair value 43.5   43.5   46.4
Limited Liability Companies and Limited Partnerships | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 271.9   271.9   325.0
Limited Liability Companies and Limited Partnerships | Fair Value, Measurements, Recurring | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 271.9   271.9   325.0
Limited Liability Companies and Limited Partnerships | Significant Unobservable Inputs (Level 3)          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Unfunded commitments 102.2   102.2    
Limited Liability Companies and Limited Partnerships | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Limited Liability Companies and Limited Partnerships | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Limited Liability Companies and Limited Partnerships | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
U.S. Government and Government Agencies and Authorities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 575.9   575.9   637.4
U.S. Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 575.9   575.9   637.4
U.S. Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
U.S. Government and Government Agencies and Authorities | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
U.S. Government and Government Agencies and Authorities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 121.6   121.6   132.8
U.S. Government and Government Agencies and Authorities | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 454.3   454.3   504.6
States and Political Subdivisions          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 1,731.2   1,731.2   1,890.1
States and Political Subdivisions | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 1,731.2   1,731.2   1,890.1
States and Political Subdivisions | Fair Value, Measurements, Recurring | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
States and Political Subdivisions | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
States and Political Subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
States and Political Subdivisions | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 1,731.2   1,731.2   1,890.1
Foreign Governments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 5.5   5.5   5.5
Foreign Governments | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 5.5   5.5   5.5
Foreign Governments | Fair Value, Measurements, Recurring | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
Foreign Governments | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
Foreign Governments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
Foreign Governments | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 5.5   5.5   5.5
Bonds and Notes          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 3,633.9   3,633.9   4,386.9
Bonds and Notes | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 3,633.9   3,633.9   4,386.9
Bonds and Notes | Fair Value, Measurements, Recurring | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
Bonds and Notes | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 177.1   177.1   236.8
Bonds and Notes | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
Bonds and Notes | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 3,456.8   3,456.8   4,150.1
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 8.1   8.1   7.4
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0    
Redeemable Preferred Stocks | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 6.9   6.9    
Redeemable Preferred Stocks | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0    
Redeemable Preferred Stocks | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 1.2   1.2    
Collateralized Loan Obligations          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 960.3   960.3   752.1
Collateralized Loan Obligations | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 960.3   960.3   752.1
Collateralized Loan Obligations | Fair Value, Measurements, Recurring | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
Collateralized Loan Obligations | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
Collateralized Loan Obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
Collateralized Loan Obligations | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 960.3   960.3   752.1
Other Mortgage- and Asset-backed          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 303.9   303.9   307.5
Other Mortgage- and Asset-backed | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 303.9   303.9   307.5
Other Mortgage- and Asset-backed | Fair Value, Measurements, Recurring | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
Other Mortgage- and Asset-backed | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 5.6   5.6   7.0
Other Mortgage- and Asset-backed | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
Other Mortgage- and Asset-backed | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 298.3   298.3   300.5
Investments in Fixed Maturities          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5)         7,986.9
Investments in Fixed Maturities | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 7,218.8   7,218.8   7,986.9
Investments in Fixed Maturities | Fair Value, Measurements, Recurring | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 0.0   0.0   0.0
Investments in Fixed Maturities | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 189.6   189.6   249.9
Investments in Fixed Maturities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 121.6   121.6   132.8
Investments in Fixed Maturities | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fixed Maturities at Fair Value (Amortized Cost: 2022 - $7,830.1; 2021 - $7,358.2 Allowance for Credit Losses: 2022 - $13.6; 2021 - $7.5) 6,907.6   6,907.6   7,604.2
Preferred Stocks | Fair Value, Measurements, Recurring | Finance, Insurance and Real Estate          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 30.1   30.1   34.2
Preferred Stocks | Fair Value, Measurements, Recurring | Finance, Insurance and Real Estate | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Preferred Stocks | Fair Value, Measurements, Recurring | Other Industries          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 15.7   15.7   17.6
Preferred Stocks | Fair Value, Measurements, Recurring | Other Industries | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Preferred Stocks | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Finance, Insurance and Real Estate          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Preferred Stocks | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Other Industries          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 1.7   1.7   1.5
Preferred Stocks | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Finance, Insurance and Real Estate          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Preferred Stocks | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Other Industries          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Preferred Stocks | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Finance, Insurance and Real Estate          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 30.1   30.1   34.2
Preferred Stocks | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Other Industries          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 14.0   14.0   16.1
Common Stock | Fair Value, Measurements, Recurring | Finance, Insurance and Real Estate          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.9   0.9   18.9
Common Stock | Fair Value, Measurements, Recurring | Finance, Insurance and Real Estate | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Common Stock | Fair Value, Measurements, Recurring | Other Industries          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.6   0.6   2.9
Common Stock | Fair Value, Measurements, Recurring | Other Industries | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Common Stock | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Finance, Insurance and Real Estate          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Common Stock | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Other Industries          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Finance, Insurance and Real Estate          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.9   0.9   18.9
Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Other Industries          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.6   0.6   2.9
Common Stock | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Finance, Insurance and Real Estate          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Common Stock | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Other Industries          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Exchange Traded Funds | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 75.8   75.8   432.0
Exchange Traded Funds | Fair Value, Measurements, Recurring | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Exchange Traded Funds | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Exchange Traded Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 75.8   75.8   432.0
Exchange Traded Funds | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 0.0   0.0   0.0
Equity Securities | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 395.0   395.0   830.6
Equity Securities | Fair Value, Measurements, Recurring | Measured at Net Asset Value          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 271.9   271.9   325.0
Equity Securities | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 1.7   1.7   1.5
Equity Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) 77.3   77.3   453.8
Equity Securities | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Equity Securities at Fair Value (Cost: 2022 - $363.1; 2021 - $618.7) $ 44.1   $ 44.1   $ 50.3