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Investments (Equity Securities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Equity Securities without Readily Determinable Fair Value [Line Items]    
Cost $ 476.2 $ 0.0
Gross Unrealized, Gains 56.2  
Gross Unrealized Losses (6.4)  
Fair Value 526.0 $ 684.4
Less than Twelve Months, Fair Value 50.9  
Twelve Months or Longer, Fair Value 8.6  
Fair Value 59.5  
Less than 12 Months, Accumulated Loss (2.5)  
12 Months or Longer, Accumulated Loss (3.9)  
Unrealized Losses (6.4)  
Exchange Traded Funds [Member]    
Equity Securities without Readily Determinable Fair Value [Line Items]    
Cost 207.6  
Gross Unrealized, Gains 11.9  
Gross Unrealized Losses 0.0  
Fair Value 219.5  
Limited Liability Companies and Limited Partnerships [Member]    
Equity Securities without Readily Determinable Fair Value [Line Items]    
Cost 184.9  
Gross Unrealized, Gains 23.9  
Gross Unrealized Losses (5.9)  
Fair Value 202.9  
Less than Twelve Months, Fair Value 48.4  
Twelve Months or Longer, Fair Value 7.7  
Fair Value 56.1  
Less than 12 Months, Accumulated Loss (2.1)  
12 Months or Longer, Accumulated Loss (3.8)  
Unrealized Losses (5.9)  
Finance, Insurance and Real Estate [Member] | Preferred Stock [Member]    
Equity Securities without Readily Determinable Fair Value [Line Items]    
Cost 51.1  
Gross Unrealized, Gains 4.6  
Gross Unrealized Losses 0.0  
Fair Value 55.7  
Less than Twelve Months, Fair Value 0.3  
Twelve Months or Longer, Fair Value 0.2  
Fair Value 0.5  
Less than 12 Months, Accumulated Loss 0.0  
12 Months or Longer, Accumulated Loss 0.0  
Unrealized Losses 0.0  
Finance, Insurance and Real Estate [Member] | Common Stock [Member]    
Equity Securities without Readily Determinable Fair Value [Line Items]    
Cost 5.5  
Gross Unrealized, Gains 1.7  
Gross Unrealized Losses (0.1)  
Fair Value 7.1  
Less than Twelve Months, Fair Value 1.6  
Twelve Months or Longer, Fair Value 0.0  
Fair Value 1.6  
Less than 12 Months, Accumulated Loss (0.1)  
12 Months or Longer, Accumulated Loss 0.0  
Unrealized Losses (0.1)  
All Industries Other than Finance, Insurance and Real Estate [Member] | Preferred Stock [Member]    
Equity Securities without Readily Determinable Fair Value [Line Items]    
Cost 17.1  
Gross Unrealized, Gains 6.0  
Gross Unrealized Losses 0.0  
Fair Value 23.1  
Less than Twelve Months, Fair Value 0.2  
Twelve Months or Longer, Fair Value 0.2  
Fair Value 0.4  
Less than 12 Months, Accumulated Loss 0.0  
12 Months or Longer, Accumulated Loss 0.0  
Unrealized Losses 0.0  
All Industries Other than Finance, Insurance and Real Estate [Member] | Common Stock [Member]    
Equity Securities without Readily Determinable Fair Value [Line Items]    
Cost 10.0  
Gross Unrealized, Gains 8.1  
Gross Unrealized Losses (0.4)  
Fair Value 17.7  
Less than Twelve Months, Fair Value 0.4  
Twelve Months or Longer, Fair Value 0.5  
Fair Value 0.9  
Less than 12 Months, Accumulated Loss (0.3)  
12 Months or Longer, Accumulated Loss (0.1)  
Unrealized Losses $ (0.4)