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Schedule IV - Reinsurance Premiums Written and Premiums Earned (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
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 written premiums |  |  |  |  |  |  |  |  |  |  |  |  | 2,082.0 | 2,212.5 | 2,593.7
Gross Amount |  |  |  |  |  |  |  |  |  |  |  |  | 1,940.5 | 1,757.4 | 1,768.4
Ceded to Other Companies |  |  |  |  |  |  |  |  |  |  |  |  | (1,319.7) | (902.6) | (449.0)
Assumed From Other Companies |  |  |  |  |  |  |  |  |  |  |  |  | 1,593.9 | 1,451.8 | 1,317.9
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
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  |  |  |  |  | 72.00% | 62.90% | 50.00%

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