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Reinsurance - Summary of Assumed and Ceded Reinsurance on Premiums Written, Premiums Earned and Insurance Losses and Loss Adjustment Expenses (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
Premiums written:
Direct													$ 1,951.2	$ 1,812.4	$ 1,733.8
Assumed													1,495.7	1,548.5	1,413.2
Ceded													(1,364.9)	(1,148.4)	(553.3)
Net premiums written													2,082.0	2,212.5	2,593.7
Premiums earned:
Direct													1,940.5	1,757.4	1,768.4
Assumed													1,593.9	1,451.8	1,317.9
Ceded													(1,319.7)	(902.6)	(449.0)
Net premiums earned	$ 538.5	$ 623.2	$ 519.5	$ 533.5	$ 511.0	$ 652.5	$ 562.0	$ 581.1	$ 612.4	$ 681.0	$ 680.8	$ 663.1	2,214.7	2,306.6	2,637.3
Insurance losses and loss adjustment expenses:
Direct													1,458.9	1,673.6	1,091.9
Assumed													1,196.1	1,399.9	699.6
Ceded													(1,082.0)	(1,078.8)	(215.4)
Net insurance losses and loss adjustment expenses	$ 521.3	$ 431.1	$ 310.4	$ 310.2	$ 544.2	$ 776.2	$ 346.1	$ 328.2	$ 387.3	$ 389.2	$ 442.2	$ 357.4	$ 1,573.0	$ 1,994.7	$ 1,576.1

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