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Investments - Mortgage Loans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Commercial mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased	$ 74.9	$ 13.5	$ 107.9	$ 46.2
Mortgage loans, Total amortized cost	$ 16,549.6		$ 16,549.6		$ 16,730.3
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	$ 3,895.3		$ 3,895.3		$ 4,322.0
Percent of mortgage loans (as a percent)	23.60%		23.60%		25.90%
Commercial mortgage loans | Retail
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,496.5		$ 1,496.5		$ 1,499.4
Percent of mortgage loans (as a percent)	9.00%		9.00%		9.00%
Commercial mortgage loans | Industrial
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 3,382.1		$ 3,382.1		$ 3,235.9
Percent of mortgage loans (as a percent)	20.40%		20.40%		19.30%
Commercial mortgage loans | Apartments
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 6,889.2		$ 6,889.2		$ 6,827.1
Percent of mortgage loans (as a percent)	41.70%		41.70%		40.80%
Commercial mortgage loans | Hotel
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 70.4		$ 70.4		$ 72.5
Percent of mortgage loans (as a percent)	0.40%		0.40%		0.40%
Commercial mortgage loans | Mixed use/other
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 816.1		$ 816.1		$ 773.4
Percent of mortgage loans (as a percent)	4.90%		4.90%		4.60%
Commercial mortgage loans | New England
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 504.7		$ 504.7		$ 512.1
Percent of mortgage loans (as a percent)	3.00%		3.00%		3.10%
Commercial mortgage loans | Middle Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,409.7		$ 4,409.7		$ 4,505.6
Percent of mortgage loans (as a percent)	26.70%		26.70%		26.90%
Commercial mortgage loans | East North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 677.1		$ 677.1		$ 652.5
Percent of mortgage loans (as a percent)	4.10%		4.10%		3.90%
Commercial mortgage loans | West North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 332.9		$ 332.9		$ 370.9
Percent of mortgage loans (as a percent)	2.00%		2.00%		2.20%
Commercial mortgage loans | South Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 2,583.3		$ 2,583.3		$ 2,558.3
Percent of mortgage loans (as a percent)	15.60%		15.60%		15.30%
Commercial mortgage loans | East South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 380.7		$ 380.7		$ 339.8
Percent of mortgage loans (as a percent)	2.30%		2.30%		2.00%
Commercial mortgage loans | West South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,213.3		$ 1,213.3		$ 1,204.9
Percent of mortgage loans (as a percent)	7.30%		7.30%		7.20%
Commercial mortgage loans | Mountain
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 901.3		$ 901.3		$ 938.7
Percent of mortgage loans (as a percent)	5.40%		5.40%		5.60%
Commercial mortgage loans | Pacific
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,969.4		$ 4,969.4		$ 5,115.3
Percent of mortgage loans (as a percent)	30.10%		30.10%		30.60%
Commercial mortgage loans | International
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 577.2		$ 577.2		$ 532.2
Percent of mortgage loans (as a percent)	3.50%		3.50%		3.20%
Residential mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased	$ 353.3	647.1	$ 422.4	1,181.4
Mortgage loans, sold	17.1	$ 478.9	21.3	$ 486.0
Mortgage loans, Total amortized cost	$ 3,968.0		$ 3,968.0		$ 3,983.0

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