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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]          
Gross cost at January 1     $ 248.6 $ 247.6  
Capitalization of internally developed software     0.0 7.0  
Exchange effect     0.0 0.1  
Disposal of subsidiary     0.0 (7.7)  
Gross cost at September 30 $ 248.6 $ 247.0 248.6 247.0  
Accumulated amortization at January 1     (79.9) (66.5)  
Amortization expense (6.1) (5.2) (18.2) (15.6)  
Exchange effect     0.0 0.0  
Disposal of subsidiary     0.0 7.7  
Accumulated amortization at September 30 (98.1) (74.4) (98.1) (74.4)  
Net book amount at September 30 $ 150.5 $ 172.6 $ 150.5 $ 172.6 $ 168.7