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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance at the beginning of the period	$ 298.6	$ 364.6	$ 294.3	$ 358.4
Acquisition costs deferred	92.5	94.9	273.5	311.1
Amortization of deferred policy acquisition costs	(101.0)	(105.4)	(277.7)	(315.4)
Balance at the end of the period	$ 290.1	$ 354.1	$ 290.1	$ 354.1

X

- Definition

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

+ References

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+ Details

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X

- 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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X

- Definition

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

+ References

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X

- 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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