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Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Available-for-sale securities
Amortized cost, fixed maturities	$ 70,862.3	$ 70,546.8
Gross unrealized gains, fixed maturities	5,454.8	8,380.0
Gross unrealized losses, fixed maturities	565.7	209.1
Allowance, fixed maturities	10.5	7.4	$ 7.6
Fair value, fixed maturities	75,740.9	78,710.3
Accrued interest receivable	576.3	552.5
U.S. government and agencies
Available-for-sale securities
Amortized cost, fixed maturities	1,836.7	1,893.1
Gross unrealized gains, fixed maturities	110.1	228.9
Gross unrealized losses, fixed maturities	60.0	10.5
Fair value, fixed maturities	1,886.8	2,111.5
Non-U.S. governments
Available-for-sale securities
Amortized cost, fixed maturities	921.2	881.6
Gross unrealized gains, fixed maturities	133.4	192.1
Gross unrealized losses, fixed maturities	0.9
Fair value, fixed maturities	1,053.7	1,073.7
States and political subdivisions
Available-for-sale securities
Amortized cost, fixed maturities	8,269.1	8,004.9
Gross unrealized gains, fixed maturities	747.2	1,175.5
Gross unrealized losses, fixed maturities	79.2	12.6
Fair value, fixed maturities	8,937.1	9,167.8
Corporate debt securities
Available-for-sale securities
Amortized cost, fixed maturities	41,493.6	41,289.9
Gross unrealized gains, fixed maturities	4,017.8	6,160.9
Gross unrealized losses, fixed maturities	321.2	95.1
Allowance, fixed maturities	0.9	0.9	7.0
Fair value, fixed maturities	45,189.3	47,354.8
Residential mortgage-backed pass-through securities
Available-for-sale securities
Amortized cost, fixed maturities	2,724.4	2,857.6
Gross unrealized gains, fixed maturities	92.0	129.4
Gross unrealized losses, fixed maturities	18.6	0.2
Fair value, fixed maturities	2,797.8	2,986.8
Commercial mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities	4,826.8	4,741.2
Gross unrealized gains, fixed maturities	171.4	241.3
Gross unrealized losses, fixed maturities	50.3	35.9
Allowance, fixed maturities	7.0	4.3	0.4
Fair value, fixed maturities	4,940.9	4,942.3
Collateralized debt obligations
Available-for-sale securities
Amortized cost, fixed maturities	4,156.4	4,045.9
Gross unrealized gains, fixed maturities	9.5	8.7
Gross unrealized losses, fixed maturities	13.0	24.9
Allowance, fixed maturities	2.6	2.2	0.1
Fair value, fixed maturities	4,150.3	4,027.5
Other debt obligations
Available-for-sale securities
Amortized cost, fixed maturities	6,634.1	6,832.6
Gross unrealized gains, fixed maturities	173.4	243.2
Gross unrealized losses, fixed maturities	22.5	29.9
Allowance, fixed maturities			$ 0.1
Fair value, fixed maturities	$ 6,785.0	$ 7,045.9

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