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Investments - Mortgage Loans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 20,924.4		$ 20,924.4		$ 20,324.5
Commercial mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased	13.5	$ 15.6	46.2	$ 104.8
Mortgage loans, sold				66.3
Mortgage loans, Total amortized cost	$ 16,607.9		$ 16,607.9		$ 16,394.7
Percent of mortgage loans (as a percent)	100.00%		100.00%		100.00%
Commercial mortgage loans | Office
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,472.3		$ 4,472.3		$ 4,789.8
Percent of mortgage loans (as a percent)	27.00%		27.00%		29.30%
Commercial mortgage loans | Retail
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,581.4		$ 1,581.4		$ 1,622.1
Percent of mortgage loans (as a percent)	9.50%		9.50%		9.90%
Commercial mortgage loans | Industrial
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 3,257.3		$ 3,257.3		$ 2,966.4
Percent of mortgage loans (as a percent)	19.60%		19.60%		18.10%
Commercial mortgage loans | Apartments
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 6,520.9		$ 6,520.9		$ 6,234.3
Percent of mortgage loans (as a percent)	39.30%		39.30%		38.00%
Commercial mortgage loans | Hotel
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 74.6		$ 74.6		$ 85.7
Percent of mortgage loans (as a percent)	0.40%		0.40%		0.50%
Commercial mortgage loans | Mixed use/other
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 701.4		$ 701.4		$ 696.4
Percent of mortgage loans (as a percent)	4.20%		4.20%		4.20%
Commercial mortgage loans | New England
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 524.6		$ 524.6		$ 585.6
Percent of mortgage loans (as a percent)	3.20%		3.20%		3.60%
Commercial mortgage loans | Middle Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,636.3		$ 4,636.3		$ 4,536.5
Percent of mortgage loans (as a percent)	27.80%		27.80%		27.70%
Commercial mortgage loans | East North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 596.0		$ 596.0		$ 623.9
Percent of mortgage loans (as a percent)	3.60%		3.60%		3.80%
Commercial mortgage loans | West North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 362.6		$ 362.6		$ 338.6
Percent of mortgage loans (as a percent)	2.20%		2.20%		2.10%
Commercial mortgage loans | South Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 2,437.0		$ 2,437.0		$ 2,464.9
Percent of mortgage loans (as a percent)	14.70%		14.70%		15.00%
Commercial mortgage loans | East South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 350.4		$ 350.4		$ 378.9
Percent of mortgage loans (as a percent)	2.10%		2.10%		2.30%
Commercial mortgage loans | West South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,155.2		$ 1,155.2		$ 1,243.7
Percent of mortgage loans (as a percent)	7.00%		7.00%		7.60%
Commercial mortgage loans | Mountain
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 974.3		$ 974.3		$ 925.6
Percent of mortgage loans (as a percent)	5.90%		5.90%		5.60%
Commercial mortgage loans | Pacific
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 5,113.6		$ 5,113.6		$ 4,864.4
Percent of mortgage loans (as a percent)	30.70%		30.70%		29.70%
Commercial mortgage loans | International
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 457.9		$ 457.9		$ 432.6
Percent of mortgage loans (as a percent)	2.80%		2.80%		2.60%
Residential mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased	$ 647.1	162.0	$ 1,181.4	813.0
Mortgage loans, sold	478.9	$ 6.6	486.0	$ 43.6
Mortgage loans, Total amortized cost	$ 3,734.6		$ 3,734.6		$ 3,319.9

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