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Recently Issued Accounting Standards - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Operating Lease, Liability $ 149.0  
Accounting Standards Update 2017-12 [Member]    
Operating Lease, Right-of-Use Asset   $ 177.2
Operating Lease, Liability   $ 182.6
Accounting Standards Update 2018 02 [Member]    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax $ 8.6