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Insurance Operations - Summary of Reconciliations of Direct to Net premiums on Written and Earned Basis Related to Wholly Owned Underwriting Enterprise Subsidiary (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Premiums Written and Earned [Abstract] |  |  |
Written, Direct | $ 44.6 | $ 57.6 | $ 60.7
Written, Assumed | 1.0 | 4.7 | 5.0
Written, Ceded | (45.6) | (62.3) | (65.7)
Written, Net | 0.0 | 0.0 | 0.0
Earned, Direct | 59.1 | 53.2 | 60.4
Earned, Assumed | 1.9 | 4.6 | 4.5
Earned, Ceded | (61.0) | (57.8) | (64.9)
Earned, Net | $ 0.0 | $ 0.0 | $ 0.0

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