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Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance at the beginning of the period				$ 294.3				$ 358.4					$ 294.3	$ 358.4
Acquisition costs deferred													325.8	336.4
Amortization of deferred policy acquisition costs	$ (93.9)	$ (101.0)	$ (85.9)	$ (90.8)	$ (85.1)	$ (105.4)	$ (96.3)	$ (113.7)	$ (141.1)	$ (130.9)	$ (126.7)	$ (130.2)	(371.6)	(400.5)	$ (528.9)
Balance at the end of the period	$ 248.5				$ 294.3				$ 358.4				$ 248.5	$ 294.3	$ 358.4

X

- Definition

Amount of amortization expense (reversal of expense) for deferred policy acquisition costs.

+ References

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- Definition

Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date.

+ References

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- Definition

Total amount of policy acquisition costs capitalized during the income statement period.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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