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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in mortgage loan valuation allowance      
Beginning balance, Mortgage loan valuation allowance $ 27.4 $ 32.7 $ 44.9
Provision: Mortgage loan valuation allowance (3.0) (6.0) (12.0)
Charge-offs: Mortgage loan valuation allowance (0.6) (2.4) (5.1)
Recoveries: Mortgage loan valuation allowance 3.2 3.1 4.9
Ending balance, Mortgage loan valuation allowance 27.0 27.4 32.7
Individually evaluated for impairment, Mortgage loan valuation allowance 1.4 1.4 4.5
Collectively evaluated for impairment, Mortgage loan valuation allowance 25.6 26.0 28.2
Individually evaluated for impairment, Mortgage loans 11.4 9.2 12.5
Collectively evaluated for impairment, Mortgage loans 16,502.5 15,355.1 14,170.7
Mortgage loans, Total amortized cost $ 16,513.9 $ 15,364.3 $ 14,183.2
Commercial mortgage loans      
Mortgage loan valuation allowance disclosures      
Mortgage loans, Days delinquent to be analyzed for valuation allowance 60 days 60 days 60 days
Changes in mortgage loan valuation allowance      
Beginning balance, Mortgage loan valuation allowance $ 24.3 $ 25.8 $ 27.4
Provision: Mortgage loan valuation allowance 0.2 (1.5) (1.6)
Ending balance, Mortgage loan valuation allowance 24.5 24.3 25.8
Collectively evaluated for impairment, Mortgage loan valuation allowance 24.5 24.3 25.8
Collectively evaluated for impairment, Mortgage loans 15,017.2 13,996.3 12,897.3
Mortgage loans, Total amortized cost 15,017.2 13,996.3 12,897.3
Residential mortgage loans      
Changes in mortgage loan valuation allowance      
Beginning balance, Mortgage loan valuation allowance 3.1 6.9 17.5
Provision: Mortgage loan valuation allowance (3.2) (4.5) (10.4)
Charge-offs: Mortgage loan valuation allowance (0.6) (2.4) (5.1)
Recoveries: Mortgage loan valuation allowance 3.2 3.1 4.9
Ending balance, Mortgage loan valuation allowance 2.5 3.1 6.9
Individually evaluated for impairment, Mortgage loan valuation allowance 1.4 1.4 4.5
Collectively evaluated for impairment, Mortgage loan valuation allowance 1.1 1.7 2.4
Individually evaluated for impairment, Mortgage loans 11.4 9.2 12.5
Collectively evaluated for impairment, Mortgage loans 1,485.3 1,358.8 1,273.4
Mortgage loans, Total amortized cost $ 1,496.7 $ 1,368.0 $ 1,285.9