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Investments - Mortgage Loans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Commercial mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased	$ 1.4	$ 21.9	$ 71.7	$ 78.9
Mortgage loans, sold	0.1	3.0	109.3	3.8
Mortgage loans, Total amortized cost	$ 16,648.6		$ 16,648.6		$ 17,072.7
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	$ 2,991.6		$ 2,991.6		$ 3,182.9
Percent of mortgage loans (as a percent)	18.00%		18.00%		18.50%
Commercial mortgage loans | Retail
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,496.7		$ 1,496.7		$ 1,476.9
Percent of mortgage loans (as a percent)	9.00%		9.00%		8.70%
Commercial mortgage loans | Industrial
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,231.3		$ 4,231.3		$ 4,364.5
Percent of mortgage loans (as a percent)	25.40%		25.40%		25.60%
Commercial mortgage loans | Apartments
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 7,097.9		$ 7,097.9		$ 7,220.4
Percent of mortgage loans (as a percent)	42.60%		42.60%		42.30%
Commercial mortgage loans | Hotel
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 31.3		$ 31.3		$ 65.0
Percent of mortgage loans (as a percent)	0.20%		0.20%		0.40%
Commercial mortgage loans | Mixed use/other
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 799.8		$ 799.8		$ 763.0
Percent of mortgage loans (as a percent)	4.80%		4.80%		4.50%
Commercial mortgage loans | New England
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 447.8		$ 447.8		$ 347.2
Percent of mortgage loans (as a percent)	2.70%		2.70%		2.00%
Commercial mortgage loans | Middle Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,421.0		$ 4,421.0		$ 4,714.9
Percent of mortgage loans (as a percent)	26.50%		26.50%		27.70%
Commercial mortgage loans | East North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 471.3		$ 471.3		$ 591.0
Percent of mortgage loans (as a percent)	2.80%		2.80%		3.50%
Commercial mortgage loans | West North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 376.3		$ 376.3		$ 394.0
Percent of mortgage loans (as a percent)	2.30%		2.30%		2.30%
Commercial mortgage loans | South Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 3,140.9		$ 3,140.9		$ 2,987.7
Percent of mortgage loans (as a percent)	18.90%		18.90%		17.50%
Commercial mortgage loans | East South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 419.9		$ 419.9		$ 417.7
Percent of mortgage loans (as a percent)	2.50%		2.50%		2.40%
Commercial mortgage loans | West South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,308.1		$ 1,308.1		$ 1,310.5
Percent of mortgage loans (as a percent)	7.90%		7.90%		7.70%
Commercial mortgage loans | Mountain
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,166.8		$ 1,166.8		$ 979.5
Percent of mortgage loans (as a percent)	7.00%		7.00%		5.70%
Commercial mortgage loans | Pacific
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,404.5		$ 4,404.5		$ 4,851.9
Percent of mortgage loans (as a percent)	26.40%		26.40%		28.40%
Commercial mortgage loans | International
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 492.0		$ 492.0		$ 478.3
Percent of mortgage loans (as a percent)	3.00%		3.00%		2.80%
Residential mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased	$ 376.7	112.3	$ 1,027.6	199.8
Mortgage loans, sold	11.1	$ 9.4	20.9	$ 22.2
Mortgage loans, Total amortized cost	$ 4,255.6		$ 4,255.6		$ 3,607.4

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