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Investments - Mortgage Loans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 20,324.5	$ 18,103.9	$ 16,513.9
Commercial mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased	118.2	166.8	200.5
Mortgage loans, sold	73.8	7.6	1.6
Mortgage loans, Total amortized cost	$ 16,394.7	$ 15,441.6	15,017.2
Percent of mortgage loans (as a percent)	100.00%	100.00%
Commercial mortgage loans | Office
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,789.8	$ 4,491.7
Percent of mortgage loans (as a percent)	29.30%	29.00%
Commercial mortgage loans | Retail
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,622.1	$ 1,815.3
Percent of mortgage loans (as a percent)	9.90%	11.80%
Commercial mortgage loans | Industrial
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 2,966.4	$ 2,488.7
Percent of mortgage loans (as a percent)	18.10%	16.10%
Commercial mortgage loans | Apartments
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 6,234.3	$ 5,958.0
Percent of mortgage loans (as a percent)	38.00%	38.60%
Commercial mortgage loans | Hotel
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 85.7	$ 89.4
Percent of mortgage loans (as a percent)	0.50%	0.60%
Commercial mortgage loans | Mixed use/other
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 696.4	$ 598.5
Percent of mortgage loans (as a percent)	4.20%	3.90%
Commercial mortgage loans | New England
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 585.6	$ 593.9
Percent of mortgage loans (as a percent)	3.60%	3.80%
Commercial mortgage loans | Middle Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,536.5	$ 4,438.2
Percent of mortgage loans (as a percent)	27.70%	28.80%
Commercial mortgage loans | East North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 623.9	$ 572.6
Percent of mortgage loans (as a percent)	3.80%	3.70%
Commercial mortgage loans | West North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 338.6	$ 267.5
Percent of mortgage loans (as a percent)	2.10%	1.70%
Commercial mortgage loans | South Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 2,464.9	$ 2,368.9
Percent of mortgage loans (as a percent)	15.00%	15.30%
Commercial mortgage loans | East South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 378.9	$ 316.6
Percent of mortgage loans (as a percent)	2.30%	2.10%
Commercial mortgage loans | West South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,243.7	$ 1,315.9
Percent of mortgage loans (as a percent)	7.60%	8.50%
Commercial mortgage loans | Mountain
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 925.6	$ 936.2
Percent of mortgage loans (as a percent)	5.60%	6.10%
Commercial mortgage loans | Pacific
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,864.4	$ 4,183.0
Percent of mortgage loans (as a percent)	29.70%	27.10%
Commercial mortgage loans | International
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 432.6	$ 448.8
Percent of mortgage loans (as a percent)	2.60%	2.90%
Residential mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased	$ 2,370.9	$ 1,151.1	489.2
Mortgage loans, sold	88.9	117.4	70.7
Mortgage loans, Total amortized cost	$ 3,319.9	$ 1,951.5	$ 1,496.7

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