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Schedule IV - Reinsurance Premiums Written and Premiums Earned (Details) - USD ($) $ in Millions	3 Months Ended												12 Months Ended
	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, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]
Direct													$ 1,812.4	$ 1,733.8	$ 1,748.4
Assumed													1,548.5	1,413.2	1,248.9
Ceded													(1,148.4)	(553.3)	(351.1)
Net written premiums													2,212.5	2,593.7	2,646.2
Gross Amount													1,757.4	1,768.4	1,703.3
Ceded to Other Companies													(902.6)	(449.0)	(383.5)
Assumed From Other Companies													1,451.8	1,317.9	1,153.5
Net premiums earned	$ 511.0	$ 652.5	$ 562.0	$ 581.1	$ 612.4	$ 681.0	$ 680.8	$ 663.1	$ 629.7	$ 640.6	$ 609.4	$ 593.6	$ 2,306.6	$ 2,637.3	$ 2,473.3
Percentage of Amount Assumed to Net													62.90%	50.00%	46.60%

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