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Investments - Fixed Maturities and Equity Securities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020
Available-for-sale securities
Amortized cost, fixed maturities	$ 70,196.6		$ 70,546.8
Gross unrealized gains, fixed maturities	6,566.1		8,380.0
Gross unrealized losses, fixed maturities	303.6		209.1
Allowance, fixed maturities	8.7	$ 10.5	7.4	$ 7.2	$ 7.6
Fair value, fixed maturities	76,450.4		78,710.3
Accrued interest receivable	544.9		552.5
U.S. government and agencies
Available-for-sale securities
Amortized cost, fixed maturities	1,820.0		1,893.1
Gross unrealized gains, fixed maturities	146.5		228.9
Gross unrealized losses, fixed maturities	40.3		10.5
Fair value, fixed maturities	1,926.2		2,111.5
Non-U.S. governments
Available-for-sale securities
Amortized cost, fixed maturities	880.8		881.6
Gross unrealized gains, fixed maturities	152.2		192.1
Gross unrealized losses, fixed maturities	0.1
Fair value, fixed maturities	1,032.9		1,073.7
States and political subdivisions
Available-for-sale securities
Amortized cost, fixed maturities	8,243.8		8,004.9
Gross unrealized gains, fixed maturities	1,042.4		1,175.5
Gross unrealized losses, fixed maturities	27.4		12.6
Fair value, fixed maturities	9,258.8		9,167.8
Corporate debt securities
Available-for-sale securities
Amortized cost, fixed maturities	41,510.7		41,289.9
Gross unrealized gains, fixed maturities	4,714.2		6,160.9
Gross unrealized losses, fixed maturities	169.1		95.1
Allowance, fixed maturities	8.5	0.9	0.9	2.8	7.0
Fair value, fixed maturities	46,047.3		47,354.8
Residential mortgage-backed pass-through securities
Available-for-sale securities
Amortized cost, fixed maturities	2,703.0		2,857.6
Gross unrealized gains, fixed maturities	82.5		129.4
Gross unrealized losses, fixed maturities	11.4		0.2
Fair value, fixed maturities	2,774.1		2,986.8
Commercial mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities	4,930.5		4,741.2
Gross unrealized gains, fixed maturities	234.3		241.3
Gross unrealized losses, fixed maturities	25.1		35.9
Allowance, fixed maturities	0.2	7.0	4.3	3.4	0.4
Fair value, fixed maturities	5,139.5		4,942.3
Collateralized debt obligations
Available-for-sale securities
Amortized cost, fixed maturities	3,607.6		4,045.9
Gross unrealized gains, fixed maturities	8.7		8.7
Gross unrealized losses, fixed maturities	10.8		24.9
Allowance, fixed maturities		$ 2.6	2.2	$ 1.0	0.1
Fair value, fixed maturities	3,605.5		4,027.5
Other debt obligations
Available-for-sale securities
Amortized cost, fixed maturities	6,500.2		6,832.6
Gross unrealized gains, fixed maturities	185.3		243.2
Gross unrealized losses, fixed maturities	19.4		29.9
Allowance, fixed maturities					$ 0.1
Fair value, fixed maturities	$ 6,666.1		$ 7,045.9

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