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Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance $ 839.8 $ 754.3  
Balance as adjusted   754.3  
Ending Balance 851.3 818.3  
Currency Translation      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (245.0) (211.9)  
Other comprehensive income (loss) (0.1) 10.7  
Ending Balance (245.1) (201.2)  
Marketable Securities      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance   4.8  
Change in accounting principle   (4.8)  
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (180.0) (172.8)  
Other comprehensive income (loss) 2.3 2.4  
Ending Balance (177.7) (170.4)  
Accumulated Defined Benefit Plans Adjustment | OPEB Plans      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance 0.7 1.2  
Other comprehensive income (loss) (0.1) (0.1)  
Ending Balance 0.6 1.1  
Total Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (424.3) (378.7)  
Change in accounting principle   (4.8) $ (4.8)
Balance as adjusted (424.3) (383.5)  
Other comprehensive income (loss) 2.1 13.0  
Ending Balance $ (422.2) $ (370.5)