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Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale securities
Amortized cost, fixed maturities	$ 72,207.0		$ 72,869.9
Gross unrealized gains, fixed maturities	768.8		5,708.6
Gross unrealized losses, fixed maturities	5,757.7		408.5
Allowance, fixed maturities	12.5	$ 20.4	15.5	$ 8.7	$ 10.5	$ 7.4
Fair value, fixed maturities	67,205.6		78,154.5
Accrued interest receivable	553.8		542.6
U.S. government and agencies
Available-for-sale securities
Amortized cost, fixed maturities	2,432.3		1,978.0
Gross unrealized gains, fixed maturities	1.3		148.0
Gross unrealized losses, fixed maturities	165.0		37.4
Fair value, fixed maturities	2,268.6		2,088.6
Non-U.S. governments
Available-for-sale securities
Amortized cost, fixed maturities	689.0		851.0
Gross unrealized gains, fixed maturities	42.3		133.1
Gross unrealized losses, fixed maturities	51.5		2.1
Fair value, fixed maturities	679.8		982.0
States and political subdivisions
Available-for-sale securities
Amortized cost, fixed maturities	7,830.1		8,290.7
Gross unrealized gains, fixed maturities	55.7		1,030.3
Gross unrealized losses, fixed maturities	715.2		16.6
Fair value, fixed maturities	7,170.6		9,304.4
Corporate debt securities
Available-for-sale securities
Amortized cost, fixed maturities	42,770.5		42,139.2
Gross unrealized gains, fixed maturities	654.4		4,044.8
Gross unrealized losses, fixed maturities	3,619.2		224.5
Allowance, fixed maturities	12.5	20.0	15.1	8.5	0.9	0.9
Fair value, fixed maturities	39,793.2		45,944.4
Residential mortgage-backed pass-through securities
Available-for-sale securities
Amortized cost, fixed maturities	2,039.3		3,122.3
Gross unrealized gains, fixed maturities	3.8		59.0
Gross unrealized losses, fixed maturities	143.8		28.4
Fair value, fixed maturities	1,899.3		3,152.9
Commercial mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities	5,742.2		5,436.2
Gross unrealized gains, fixed maturities	2.7		157.8
Gross unrealized losses, fixed maturities	453.3		31.5
Allowance, fixed maturities		0.3	0.3	$ 0.2	7.0	4.3
Fair value, fixed maturities	5,291.6		5,562.2
Collateralized debt obligations
Available-for-sale securities
Amortized cost, fixed maturities	3,751.4		3,564.7
Gross unrealized gains, fixed maturities	1.5		4.5
Gross unrealized losses, fixed maturities	111.5		9.6
Allowance, fixed maturities					$ 2.6	$ 2.2
Fair value, fixed maturities	3,641.4		3,559.6
Other debt obligations
Available-for-sale securities
Amortized cost, fixed maturities	6,952.2		7,487.8
Gross unrealized gains, fixed maturities	7.1		131.1
Gross unrealized losses, fixed maturities	498.2		58.4
Allowance, fixed maturities		$ 0.1	0.1
Fair value, fixed maturities	$ 6,461.1		$ 7,560.4

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