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Investments - Mortgage Loans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Commercial mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased	$ 39.9	$ 57.0
Mortgage loans, sold	68.9	0.8
Mortgage loans, Total amortized cost	$ 16,659.4		$ 17,072.7
Percent of mortgage loans (as a percent)	100.00%		100.00%
Commercial mortgage loans | Office
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 3,060.1		$ 3,182.9
Percent of mortgage loans (as a percent)	18.40%		18.50%
Commercial mortgage loans | Retail
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,445.5		$ 1,476.9
Percent of mortgage loans (as a percent)	8.70%		8.70%
Commercial mortgage loans | Industrial
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,130.7		$ 4,364.5
Percent of mortgage loans (as a percent)	24.80%		25.60%
Commercial mortgage loans | Apartments
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 7,171.8		$ 7,220.4
Percent of mortgage loans (as a percent)	43.00%		42.30%
Commercial mortgage loans | Hotel
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 64.1		$ 65.0
Percent of mortgage loans (as a percent)	0.40%		0.40%
Commercial mortgage loans | Mixed use/other
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 787.2		$ 763.0
Percent of mortgage loans (as a percent)	4.70%		4.50%
Commercial mortgage loans | New England
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 342.9		$ 347.2
Percent of mortgage loans (as a percent)	2.10%		2.00%
Commercial mortgage loans | Middle Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,567.9		$ 4,714.9
Percent of mortgage loans (as a percent)	27.50%		27.70%
Commercial mortgage loans | East North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 457.3		$ 591.0
Percent of mortgage loans (as a percent)	2.70%		3.50%
Commercial mortgage loans | West North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 358.1		$ 394.0
Percent of mortgage loans (as a percent)	2.10%		2.30%
Commercial mortgage loans | South Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 2,978.0		$ 2,987.7
Percent of mortgage loans (as a percent)	17.90%		17.50%
Commercial mortgage loans | East South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 415.7		$ 417.7
Percent of mortgage loans (as a percent)	2.50%		2.40%
Commercial mortgage loans | West South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,306.9		$ 1,310.5
Percent of mortgage loans (as a percent)	7.80%		7.70%
Commercial mortgage loans | Mountain
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 972.9		$ 979.5
Percent of mortgage loans (as a percent)	5.80%		5.70%
Commercial mortgage loans | Pacific
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,756.4		$ 4,851.9
Percent of mortgage loans (as a percent)	28.60%		28.40%
Commercial mortgage loans | International
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 503.3		$ 478.3
Percent of mortgage loans (as a percent)	3.00%		2.80%
Residential mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased	$ 265.0	38.4
Mortgage loans, sold	3.9	$ 4.9
Mortgage loans, Total amortized cost	$ 3,796.5		$ 3,607.4

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