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Investments - Mortgage Loans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 19,153.6		$ 19,153.6		$ 18,103.9
Commercial mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased	15.6	$ 73.5	104.8	$ 86.3
Mortgage loans, sold			66.3	1.1
Mortgage loans, Total amortized cost	$ 16,161.5		$ 16,161.5		$ 15,441.6
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	$ 4,581.6		$ 4,581.6		$ 4,491.7
Percent of mortgage loans (as a percent)	28.40%		28.40%		29.00%
Commercial mortgage loans | Retail
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,699.1		$ 1,699.1		$ 1,815.3
Percent of mortgage loans (as a percent)	10.50%		10.50%		11.80%
Commercial mortgage loans | Industrial
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 2,939.7		$ 2,939.7		$ 2,488.7
Percent of mortgage loans (as a percent)	18.20%		18.20%		16.10%
Commercial mortgage loans | Apartments
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 6,189.5		$ 6,189.5		$ 5,958.0
Percent of mortgage loans (as a percent)	38.30%		38.30%		38.60%
Commercial mortgage loans | Hotel
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 87.7		$ 87.7		$ 89.4
Percent of mortgage loans (as a percent)	0.50%		0.50%		0.60%
Commercial mortgage loans | Mixed use/other
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 663.9		$ 663.9		$ 598.5
Percent of mortgage loans (as a percent)	4.10%		4.10%		3.90%
Commercial mortgage loans | New England
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 659.4		$ 659.4		$ 593.9
Percent of mortgage loans (as a percent)	4.10%		4.10%		3.80%
Commercial mortgage loans | Middle Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,523.0		$ 4,523.0		$ 4,438.2
Percent of mortgage loans (as a percent)	27.90%		27.90%		28.80%
Commercial mortgage loans | East North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 604.6		$ 604.6		$ 572.6
Percent of mortgage loans (as a percent)	3.70%		3.70%		3.70%
Commercial mortgage loans | West North Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 283.3		$ 283.3		$ 267.5
Percent of mortgage loans (as a percent)	1.80%		1.80%		1.70%
Commercial mortgage loans | South Atlantic
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 2,399.9		$ 2,399.9		$ 2,368.9
Percent of mortgage loans (as a percent)	14.80%		14.80%		15.30%
Commercial mortgage loans | East South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 349.0		$ 349.0		$ 316.6
Percent of mortgage loans (as a percent)	2.20%		2.20%		2.10%
Commercial mortgage loans | West South Central
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,349.6		$ 1,349.6		$ 1,315.9
Percent of mortgage loans (as a percent)	8.40%		8.40%		8.50%
Commercial mortgage loans | Mountain
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 1,033.1		$ 1,033.1		$ 936.2
Percent of mortgage loans (as a percent)	6.40%		6.40%		6.10%
Commercial mortgage loans | Pacific
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 4,477.1		$ 4,477.1		$ 4,183.0
Percent of mortgage loans (as a percent)	27.70%		27.70%		27.10%
Commercial mortgage loans | International
Mortgage loan disclosures
Mortgage loans, Total amortized cost	$ 482.5		$ 482.5		$ 448.8
Percent of mortgage loans (as a percent)	3.00%		3.00%		2.90%
Residential mortgage loans
Mortgage loan disclosures
Mortgage loans, purchased	$ 162.0	267.7	$ 813.0	494.5
Mortgage loans, sold	6.6	$ 48.5	43.6	$ 73.4
Mortgage loans, Total amortized cost	$ 2,298.1		$ 2,298.1		$ 1,951.5

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