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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] |  |  |
Direct | $ 2,042.8 | $ 1,956.9 | $ 1,951.2
Assumed | 1,660.8 | 1,485.5 | 1,495.7
Ceded | (1,120.7) | (1,014.5) | (1,364.9)
Net written premiums | 2,582.9 | 2,427.9 | 2,082.0
Gross Amount | 2,027.1 | 1,927.5 | 1,940.5
Assumed From Other Companies | 1,616.4 | 1,494.9 | 1,593.9
Ceded | (1,110.9) | (1,129.1) | (1,319.7)
Net premiums earned | $ 2,532.6 | $ 2,293.3 | $ 2,214.7
Percentage of Amount Assumed to Net | 63.80% | 65.20% | 72.00%

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