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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Premiums Written and Earned [Abstract] |  |  |
Written, Direct | $ 57.6 | $ 60.7 | $ 71.8
Written, Assumed | 4.7 | 5.0 | 5.2
Written, Ceded | (62.3) | (65.7) | (77.0)
Written, Net | 0.0 | 0.0 | 0.0
Earned, Direct | 53.2 | 60.4 | 69.6
Earned, Assumed | 4.6 | 4.5 | 4.9
Earned, Ceded | (57.8) | (64.9) | (74.5)
Earned, Net | $ 0.0 | $ 0.0 | $ 0.0

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