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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, 2018
Mar. 31, 2017
Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance $ 754.3    
Balance at beginning of period, as adjusted     $ 754.3
Ending Balance 818.3    
Currency Translation      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (211.9) $ (269.6)  
Other comprehensive income (loss) 10.7 9.0  
Ending Balance (201.2) (260.6)  
Marketable Securities      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance 4.8 1.8  
Change in accounting principle (4.8)    
Balance at beginning of period, as adjusted   1.8  
Other comprehensive income (loss)   (0.2)  
Ending Balance   1.6  
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (172.8) (184.8)  
Other comprehensive income (loss) 2.4 3.1  
Ending Balance (170.4) (181.7)  
Accumulated Defined Benefit Plans Adjustment | OPEB Plans      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance 1.2 1.8  
Other comprehensive income (loss) (0.1) (0.1)  
Ending Balance 1.1 1.7  
Interest Rate Swap      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance   (2.0)  
Reclassification adjustment   0.6  
Ending Balance   (1.4)  
Total Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (378.7) (452.8)  
Change in accounting principle (4.8)    
Balance at beginning of period, as adjusted (383.5) (452.8) $ (383.5)
Other comprehensive income (loss) 13.0 12.4  
Ending Balance $ (370.5) $ (440.4)