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Deferred Policy Acquisition Costs - Reconciliation of Beginning and Ending Deferred Policy Acquisition Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance at the beginning of the period	$ 248.5	$ 294.3
Acquisition costs deferred	128.1	116.4
Amortization of deferred policy acquisition costs	(88.2)	(90.8)
Balance at the end of the period	$ 288.4	$ 319.9

X

- Definition

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

+ References

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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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