Fair Value Measurements - Level 3 Inputs Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Year	$ 230.0	$ 251.4
Total (Losses) Gains:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	$ (1.5)	(12.7)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Changes in Net Unrealized Holding Gains (Losses) on Investment Securities
Included in Other Comprehensive Income	$ 6.8	(22.6)
Purchases	51.6	112.5
Settlements	0.0	0.0
Sales	(102.6)	(116.0)
Transfers into Level 3	8.1	23.1
Transfers out of Level 3	(0.1)	(5.7)
Balance at End of Year	$ 192.3	230.0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Net Realized Investment (Losses) Gains
Fair Value	$ 6,881.9	6,894.8
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	225.8	243.2	[1]
Other Short-term Investments, Fair Value Disclosure	520.9	278.4
Policyholder Obligations	655.7	701.3	[2]
Estimated fair value, assets		1.7
FHLB of Chicago | United Insurance
Total (Losses) Gains:
Policyholder Obligations	557.4	601.0
Redeemable Preferred Stocks
Total (Losses) Gains:
Fair Value	8.3	8.0
United States Government and Government Agencies and Authorities
Total (Losses) Gains:
Fair Value	511.5	528.0
States and Political Subdivisions
Total (Losses) Gains:
Fair Value	1,401.9	1,568.9
Debt Security, Government, Non-US [Member]
Total (Losses) Gains:
Fair Value	3.8	4.1
Corporate Debt Securities [Member]
Total (Losses) Gains:
Fair Value	3,690.8	3,539.4
Collateralized Loan Obligations
Total (Losses) Gains:
Fair Value	949.8	953.9
Other Mortgage- and Asset-backed
Total (Losses) Gains:
Fair Value	315.8	292.5
Fair Value, Recurring
Total (Losses) Gains:
Investments, Fair Value Disclosure	7,122.4	7,183.0
Liabilities, Fair Value Disclosure		(0.4)
Convertible Securities at Fair Value		43.3
Estimated fair value, assets	14.7
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Investments, Fair Value Disclosure	107.3	117.0
Liabilities, Fair Value Disclosure		0.0
Convertible Securities at Fair Value		0.0
Estimated fair value, assets	0.0	0.0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Investments, Fair Value Disclosure	6,631.4	6,646.9
Liabilities, Fair Value Disclosure		(0.4)
Convertible Securities at Fair Value		43.3
Estimated fair value, assets	14.7	1.7
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Investments, Fair Value Disclosure	192.3	230.0
Liabilities, Fair Value Disclosure		0.0
Convertible Securities at Fair Value		0.0
Estimated fair value, assets	0.0	0.0
Fair Value, Recurring | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Investments, Fair Value Disclosure	191.4	189.1
Liabilities, Fair Value Disclosure		0.0
Convertible Securities at Fair Value		0.0
Estimated fair value, assets	0.0	0.0
Fair Value, Recurring | Redeemable Preferred Stocks
Total (Losses) Gains:
Fair Value	8.3
Fair Value, Recurring | Redeemable Preferred Stocks | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Fair Value		0.0
Fair Value, Recurring | Redeemable Preferred Stocks | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Fair Value		1.2
Fair Value, Recurring | Redeemable Preferred Stocks | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Fair Value		6.8
Fair Value, Recurring | Redeemable Preferred Stocks | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Fair Value		0.0
Fair Value, Recurring | United States Government and Government Agencies and Authorities
Total (Losses) Gains:
Fair Value	511.5	528.0
Fair Value, Recurring | United States Government and Government Agencies and Authorities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Fair Value	98.8	103.6
Fair Value, Recurring | United States Government and Government Agencies and Authorities | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Fair Value	412.7	424.4
Fair Value, Recurring | United States Government and Government Agencies and Authorities | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | United States Government and Government Agencies and Authorities | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | States and Political Subdivisions
Total (Losses) Gains:
Fair Value	1,401.9	1,568.9
Fair Value, Recurring | States and Political Subdivisions | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | States and Political Subdivisions | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Fair Value	1,401.8	1,568.9
Fair Value, Recurring | States and Political Subdivisions | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Fair Value	0.1	0.0
Fair Value, Recurring | States and Political Subdivisions | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | Debt Security, Government, Non-US [Member]
Total (Losses) Gains:
Fair Value	3.8	4.1
Fair Value, Recurring | Debt Security, Government, Non-US [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | Debt Security, Government, Non-US [Member] | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Fair Value	3.8	4.1
Fair Value, Recurring | Debt Security, Government, Non-US [Member] | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | Corporate Debt Securities [Member]
Total (Losses) Gains:
Fair Value	3,690.8	3,539.4
Fair Value, Recurring | Corporate Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Fair Value	3,513.7	3,323.4
Fair Value, Recurring | Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Fair Value	177.1	216.0
Fair Value, Recurring | Corporate Debt Securities [Member] | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | Redeemable Preferred Stock
Total (Losses) Gains:
Fair Value		8.0
Fair Value, Recurring | Redeemable Preferred Stock | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Fair Value	0.0
Fair Value, Recurring | Redeemable Preferred Stock | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Fair Value	1.2
Fair Value, Recurring | Redeemable Preferred Stock | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Fair Value	7.1
Fair Value, Recurring | Redeemable Preferred Stock | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Fair Value	0.0
Fair Value, Recurring | Collateralized Loan Obligations
Total (Losses) Gains:
Fair Value	949.8	953.9
Fair Value, Recurring | Collateralized Loan Obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | Collateralized Loan Obligations | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Fair Value	949.8	953.9
Fair Value, Recurring | Collateralized Loan Obligations | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | Collateralized Loan Obligations | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | Other Mortgage- and Asset-backed
Total (Losses) Gains:
Fair Value	315.8	292.5
Fair Value, Recurring | Other Mortgage- and Asset-backed | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | Other Mortgage- and Asset-backed | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Fair Value	310.6	287.4
Fair Value, Recurring | Other Mortgage- and Asset-backed | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Fair Value	5.2	5.1
Fair Value, Recurring | Other Mortgage- and Asset-backed | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | Investments in Fixed Maturities
Total (Losses) Gains:
Fair Value	6,881.9	6,894.8
Fair Value, Recurring | Investments in Fixed Maturities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Fair Value	98.8	103.6
Fair Value, Recurring | Investments in Fixed Maturities | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Fair Value	6,593.6	6,563.3
Fair Value, Recurring | Investments in Fixed Maturities | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Fair Value	189.5	227.9
Fair Value, Recurring | Investments in Fixed Maturities | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Fair Value	0.0	0.0
Fair Value, Recurring | Preferred Stocks | Finance, Insurance and Real Estate
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	15.6	29.0
Fair Value, Recurring | Preferred Stocks | Other Industries
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	9.9	10.8
Fair Value, Recurring | Preferred Stocks | Quoted Prices in Active Markets for Identical Assets (Level 1) | Finance, Insurance and Real Estate
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.0
Fair Value, Recurring | Preferred Stocks | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Industries
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.0
Fair Value, Recurring | Preferred Stocks | Significant Other Observable Inputs (Level 2) | Finance, Insurance and Real Estate
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	15.6	29.0
Fair Value, Recurring | Preferred Stocks | Significant Other Observable Inputs (Level 2) | Other Industries
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	7.5	9.2
Fair Value, Recurring | Preferred Stocks | Significant Unobservable Inputs (Level 3) | Finance, Insurance and Real Estate
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.0
Fair Value, Recurring | Preferred Stocks | Significant Unobservable Inputs (Level 3) | Other Industries
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	2.4	1.6
Fair Value, Recurring | Preferred Stocks | Fair Value, Inputs, Net Asset Value | Finance, Insurance and Real Estate
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.0
Fair Value, Recurring | Preferred Stocks | Fair Value, Inputs, Net Asset Value | Other Industries
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.0
Fair Value, Recurring | Common Stock | Finance, Insurance and Real Estate
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.6	0.9
Fair Value, Recurring | Common Stock | Other Industries
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.6	1.2
Fair Value, Recurring | Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1) | Finance, Insurance and Real Estate
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.6	0.9
Fair Value, Recurring | Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Industries
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.2	0.3
Fair Value, Recurring | Common Stock | Significant Other Observable Inputs (Level 2) | Finance, Insurance and Real Estate
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.0
Fair Value, Recurring | Common Stock | Significant Other Observable Inputs (Level 2) | Other Industries
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.4
Fair Value, Recurring | Common Stock | Significant Unobservable Inputs (Level 3) | Finance, Insurance and Real Estate
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.0
Fair Value, Recurring | Common Stock | Significant Unobservable Inputs (Level 3) | Other Industries
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.4	0.5
Fair Value, Recurring | Common Stock | Fair Value, Inputs, Net Asset Value | Finance, Insurance and Real Estate
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.0
Fair Value, Recurring | Common Stock | Fair Value, Inputs, Net Asset Value | Other Industries
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.0
Fair Value, Recurring | Bond Exchange Traded Funds
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	7.7	12.2
Fair Value, Recurring | Bond Exchange Traded Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	7.7	12.2
Fair Value, Recurring | Bond Exchange Traded Funds | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0
Fair Value, Recurring | Bond Exchange Traded Funds | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0
Fair Value, Recurring | Bond Exchange Traded Funds | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.0
Fair Value, Recurring | Partnership Interest [Member]
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	191.4	189.1
Fair Value, Recurring | Partnership Interest [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.0
Fair Value, Recurring | Partnership Interest [Member] | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.0
Fair Value, Recurring | Partnership Interest [Member] | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	0.0	0.0
Fair Value, Recurring | Partnership Interest [Member] | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	191.4	189.1
Fair Value, Recurring | Dividends on Equity Securities Excluding Alternative Investments
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	225.8	243.2
Fair Value, Recurring | Dividends on Equity Securities Excluding Alternative Investments | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	8.5	13.4
Fair Value, Recurring | Dividends on Equity Securities Excluding Alternative Investments | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	23.1	38.6
Fair Value, Recurring | Dividends on Equity Securities Excluding Alternative Investments | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	2.8	2.1
Fair Value, Recurring | Dividends on Equity Securities Excluding Alternative Investments | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Equity Securities at Fair Value (Cost: 2023 - $209.3; 2022 - $247.6)	191.4	189.1
Fair Value, Recurring | Designated as Hedging Instrument
Total (Losses) Gains:
Derivative Instruments Not Designated as Cash Flow Hedges		(0.4)
Fair Value, Recurring | Designated as Hedging Instrument | Quoted Prices in Active Markets for Identical Assets (Level 1)
Total (Losses) Gains:
Derivative Instruments Not Designated as Cash Flow Hedges		0.0
Fair Value, Recurring | Designated as Hedging Instrument | Significant Other Observable Inputs (Level 2)
Total (Losses) Gains:
Derivative Instruments Not Designated as Cash Flow Hedges		(0.4)
Fair Value, Recurring | Designated as Hedging Instrument | Significant Unobservable Inputs (Level 3)
Total (Losses) Gains:
Derivative Instruments Not Designated as Cash Flow Hedges		0.0
Fair Value, Recurring | Designated as Hedging Instrument | Fair Value, Inputs, Net Asset Value
Total (Losses) Gains:
Derivative Instruments Not Designated as Cash Flow Hedges		0.0
Corporate Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Year	216.0	236.8
Total (Losses) Gains:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(0.7)	(12.7)
Included in Other Comprehensive Income	6.4	(19.2)
Purchases	50.4	107.8
Settlements	0.0	0.0
Sales	(102.6)	(114.1)
Transfers into Level 3	7.7	23.1
Transfers out of Level 3	(0.1)	(5.7)
Balance at End of Year	177.1	216.0
States and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Year	0.0
Total (Losses) Gains:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0.0
Included in Other Comprehensive Income	0.0
Purchases	0.1
Settlements	0.0
Sales	0.0
Transfers into Level 3	0.0
Transfers out of Level 3	0.0
Balance at End of Year	0.1	0.0
Redeemable Preferred Stocks
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Year	6.8	6.1
Total (Losses) Gains:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0.0	0.0
Included in Other Comprehensive Income	0.3	(1.3)
Purchases	0.0	2.0
Settlements	0.0	0.0
Sales	0.0	0.0
Transfers into Level 3	0.0	0.0
Transfers out of Level 3	0.0	0.0
Balance at End of Year	7.1	6.8
Collateralized Loan Obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Year	0.0	0.0
Total (Losses) Gains:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings		0.0
Included in Other Comprehensive Income		0.0
Purchases		0.0
Settlements		0.0
Sales		0.0
Transfers into Level 3		0.0
Transfers out of Level 3		0.0
Balance at End of Year		0.0
Other Mortgage- and Asset-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Year	5.1	7.0
Total (Losses) Gains:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0.0	0.0
Included in Other Comprehensive Income	0.1	(1.9)
Purchases	0.0	0.0
Settlements	0.0	0.0
Sales	0.0	0.0
Transfers into Level 3	0.0	0.0
Transfers out of Level 3	0.0	0.0
Balance at End of Year	5.2	5.1
Dividends on Equity Securities Excluding Alternative Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Year	2.1	1.5
Total (Losses) Gains:
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(0.8)	0.0
Included in Other Comprehensive Income	0.0	(0.2)
Purchases	1.1	2.7
Settlements	0.0	0.0
Sales	0.0	(1.9)
Transfers into Level 3	0.4	0.0
Transfers out of Level 3	0.0	0.0
Balance at End of Year	$ 2.8	$ 2.1

[1] As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been recast to reflect application of the new guidance. See Note 2 to the Consolidated Financial Statements for additional information.

[2] As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been recast to reflect application of the new guidance. See Note 2 to the Consolidated Financial Statements for additional information.