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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	$ 52.9	$ 33.1
Provision: Financing receivable valuation allowance	(4.0)	12.9
Charge-offs: Financing receivable valuation allowance	(0.1)	(0.1)
Recoveries: Financing receivable valuation allowance	1.0	0.6
Ending balance, Financing receivable valuation allowance	49.8	46.5
Financing receivables, Total amortized cost	$ 18,943.2		$ 18,103.9
Commercial mortgage loans
Financing receivable valuation allowance disclosures
Mortgage loans, Days delinquent to be analyzed for valuation allowance	60 days
Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	$ 43.2	27.3
Provision: Financing receivable valuation allowance	(0.1)	10.4
Ending balance, Financing receivable valuation allowance	43.1	37.7
Financing receivables, Total amortized cost	15,841.9		15,441.6
Direct financing leases
Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	0.1
Provision: Financing receivable valuation allowance		0.2
Ending balance, Financing receivable valuation allowance	0.1	0.2
Financing receivables, Total amortized cost	$ 719.0		710.8
Residential mortgage loans
Financing receivable valuation allowance disclosures
Mortgage loans, Days delinquent to be analyzed for valuation allowance	60 days
Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	$ 6.9	3.3
Provision: Financing receivable valuation allowance	(3.9)	2.3
Charge-offs: Financing receivable valuation allowance	(0.1)	(0.1)
Recoveries: Financing receivable valuation allowance	1.0	0.6
Ending balance, Financing receivable valuation allowance	3.9	6.1
Financing receivables, Total amortized cost	2,382.3		$ 1,951.5
Reinsurance recoverables
Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	2.7	2.5
Ending balance, Financing receivable valuation allowance	$ 2.7	$ 2.5

X

- Definition

The numbers of days for which a mortgage loan has been delinquent such that it is analyzed to determine if a valuation allowance is needed.

+ References

No definition available.

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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount, before allowance for credit loss, of financing receivable.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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