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Investments - Mortgage Loans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Commercial mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased		$ 74.9	$ 57.0	$ 107.9
Mortgage loans, sold			0.8
Mortgage loans, Total amortized cost	$ 16,855.7		$ 16,855.7		$ 16,581.8
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	$ 3,444.6		$ 3,444.6		$ 3,643.0
Percent of mortgage loans (as a percent)	20.40%		20.40%		21.90%
Commercial mortgage loans | Retail
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,428.2		$ 1,428.2		$ 1,454.7
Percent of mortgage loans (as a percent)	8.50%		8.50%		8.80%
Commercial mortgage loans | Industrial
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 3,880.0		$ 3,880.0		$ 3,515.7
Percent of mortgage loans (as a percent)	23.00%		23.00%		21.20%
Commercial mortgage loans | Apartments
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 7,241.6		$ 7,241.6		$ 7,128.2
Percent of mortgage loans (as a percent)	43.00%		43.00%		43.00%
Commercial mortgage loans | Hotel
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 66.8		$ 66.8		$ 68.6
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	$ 794.5		$ 794.5		$ 771.6
Percent of mortgage loans (as a percent)	4.70%		4.70%		4.70%
Commercial mortgage loans | New England
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 352.4		$ 352.4		$ 366.5
Percent of mortgage loans (as a percent)	2.10%		2.10%		2.20%
Commercial mortgage loans | Middle Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,575.1		$ 4,575.1		$ 4,512.6
Percent of mortgage loans (as a percent)	27.00%		27.00%		27.10%
Commercial mortgage loans | East North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 590.7		$ 590.7		$ 583.3
Percent of mortgage loans (as a percent)	3.50%		3.50%		3.50%
Commercial mortgage loans | West North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 352.0		$ 352.0		$ 336.0
Percent of mortgage loans (as a percent)	2.10%		2.10%		2.00%
Commercial mortgage loans | South Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 2,874.0		$ 2,874.0		$ 2,761.9
Percent of mortgage loans (as a percent)	17.10%		17.10%		16.70%
Commercial mortgage loans | East South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 474.5		$ 474.5		$ 429.4
Percent of mortgage loans (as a percent)	2.80%		2.80%		2.60%
Commercial mortgage loans | West South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,274.2		$ 1,274.2		$ 1,268.6
Percent of mortgage loans (as a percent)	7.60%		7.60%		7.70%
Commercial mortgage loans | Mountain
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 872.5		$ 872.5		$ 824.2
Percent of mortgage loans (as a percent)	5.20%		5.20%		5.00%
Commercial mortgage loans | Pacific
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,992.9		$ 4,992.9		$ 4,974.4
Percent of mortgage loans (as a percent)	29.60%		29.60%		30.00%
Commercial mortgage loans | International
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 497.4		$ 497.4		$ 524.9
Percent of mortgage loans (as a percent)	3.00%		3.00%		3.20%
Residential mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased	$ 49.1	353.3	$ 87.5	422.4
Mortgage loans, sold	7.9	$ 17.1	12.8	$ 21.3
Mortgage loans, Total amortized cost	$ 3,571.8		$ 3,571.8		$ 3,696.5

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