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Summary of Significant Accounting Policies - Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Currency translation adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total $ (79.7) $ (68.8)
Unrealized losses on defined benefit plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total (4.6) (3.9)
Fortitude Re available-for-sale securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total 1.0 0.0
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total $ (83.3) $ (72.7)