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Restructuring Costs - Schedule of Restructuring Costs (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 30.5 $ 11.0 $ 43.8 $ 28.7
Project Renewal [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 8.9 2.1 10.4 13.2
Employee Severance, Termination Benefits and Relocation Costs [Member] | Project Renewal [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 1.0 (3.9) 1.6 (5.4)
Exited Contractual Commitments and Other [Member] | Project Renewal [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 7.9 $ 6.0 $ 8.8 $ 18.6