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Stockholder's Equity - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance $ 461.9 $ 781.1 $ 935.1
Other comprehensive income (loss) (40.8) (76.2) (183.8)
Ending Balance 395.0 461.9 781.1
Currency Translation      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (252.0) (159.8) (56.8)
Other comprehensive income (loss) (17.6) (92.2) (103.0)
Ending Balance (269.6) (252.0) (159.8)
Marketable Securities      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (0.6) (2.9) 10.8
Other comprehensive income (loss) 2.4 (6.5) (13.7)
Less reclassification adjustment   8.8  
Ending Balance 1.8 (0.6) (2.9)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (159.2) (175.4) (109.4)
Other comprehensive income (loss) 8.5 10.0 7.2
Net actuarial gain (loss) arising during year (34.1) 6.2 (73.2)
Ending Balance (184.8) (159.2) (175.4)
Accumulated Defined Benefit Plans Adjustment | OPEB Plans      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance 2.1 2.3 3.4
Other comprehensive income (loss) (0.4) (0.4) (0.5)
Net actuarial gain (loss) arising during year 0.1 0.2 (0.6)
Ending Balance 1.8 2.1 2.3
Interest Rate Swap      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (2.3)    
Other comprehensive income (loss) (2.0) (2.9)  
Less reclassification adjustment 2.3 0.6  
Ending Balance (2.0) (2.3)  
Total Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (412.0) (335.8) (152.0)
Ending Balance $ (452.8) $ (412.0) $ (335.8)