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Deferred Policy Acquisition Costs - Reconciliation of Beginning and Ending Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance at the beginning of the period	$ 364.6	$ 409.1	$ 358.4	$ 361.1
Acquisition costs deferred	94.9	110.0	311.1	414.9
Amortization of deferred policy acquisition costs	(105.4)	(130.9)	(315.4)	(387.8)
Balance at the end of the period	$ 354.1	$ 388.2	$ 354.1	$ 388.2

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

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

+ References

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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

No definition available.

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