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Schedule IV - Reinsurance Premiums Written and Premiums Earned (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] |  |  |
Direct | $ 1,956.9 | $ 1,951.2 | $ 1,812.4
Assumed | 1,485.5 | 1,495.7 | 1,548.5
Ceded | (1,014.5) | (1,364.9) | (1,148.4)
Net written premiums | 2,427.9 | 2,082.0 | 2,212.5
Gross Amount | 1,927.5 | 1,940.5 | 1,757.4
Assumed From Other Companies | 1,494.9 | 1,593.9 | 1,451.8
Ceded | (1,129.1) | (1,319.7) | (902.6)
Net premiums earned | $ 2,293.3 | $ 2,214.7 | $ 2,306.6
Percentage of Amount Assumed to Net | 65.20% | 72.00% | 62.90%

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