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Investments - Mortgage Loan Valuation Allowance (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
Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	$ 49.8	$ 46.5	$ 52.9	$ 33.1
Provision: Financing receivable valuation allowance	(7.5)	1.7	(11.5)	14.6
Charge-offs: Financing receivable valuation allowance	(0.2)	(0.1)	(0.3)	(0.2)
Recoveries: Financing receivable valuation allowance	0.7	0.6	1.7	1.2
Effect of exchange rates: Financing receivable valuation allowance	(0.1)		(0.1)
Ending balance, Financing receivable valuation allowance	42.7	48.7	42.7	48.7
Financing receivables, Total amortized cost	19,153.6		$ 19,153.6		$ 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	43.1	37.7	$ 43.2	27.3
Provision: Financing receivable valuation allowance	(6.4)	2.7	(6.5)	13.1
Effect of exchange rates: Financing receivable valuation allowance	(0.1)		(0.1)
Ending balance, Financing receivable valuation allowance	36.6	40.4	36.6	40.4
Financing receivables, Total amortized cost	16,161.5		16,161.5		15,441.6
Direct financing leases
Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	0.1	0.2	0.1
Provision: Financing receivable valuation allowance	0.2		0.2	0.2
Ending balance, Financing receivable valuation allowance	0.3	0.2	0.3	0.2
Financing receivables, Total amortized cost	694.0		$ 694.0		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	3.9	6.1	$ 6.9	3.3
Provision: Financing receivable valuation allowance	(1.2)	(1.0)	(5.1)	1.3
Charge-offs: Financing receivable valuation allowance	(0.2)	(0.1)	(0.3)	(0.2)
Recoveries: Financing receivable valuation allowance	0.7	0.6	1.7	1.2
Ending balance, Financing receivable valuation allowance	3.2	5.6	3.2	5.6
Financing receivables, Total amortized cost	2,298.1		2,298.1		$ 1,951.5
Reinsurance recoverables
Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	2.7	2.5	2.7	2.5
Provision: Financing receivable valuation allowance	(0.1)		(0.1)
Ending balance, Financing receivable valuation allowance	$ 2.6	$ 2.5	$ 2.6	$ 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

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Amount of foreign currency translation adjustment increasing or decreasing the valuation allowance for financing receivables.

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- Definition

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

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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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