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Cost Reduction Actions - Individual Components of Work Force Reduction and Idle Lease Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Restructuring Reserve [Roll Forward]          
Charges for work-force reductions / Additional provisions $ 10.2 $ 52.6 $ 37.1 $ 52.6 $ 118.5
Work-force reduction costs          
Restructuring Reserve [Roll Forward]          
Balance at beginning of period     33.0    
Charges for work-force reductions / Additional provisions     32.2   78.8
Utilized     (30.2)   (45.3)
Changes in estimates and revisions     (3.6)    
Translation adjustments     1.1   (0.5)
Balance at end of period 32.5   32.5   33.0
Work-force reduction costs | 2016 remaining six months          
Restructuring Reserve [Roll Forward]          
Expected future utilization 29.7   29.7    
Work-force reduction costs | Beyond 2016          
Restructuring Reserve [Roll Forward]          
Expected future utilization 2.8   2.8    
Work-force reduction costs | United States          
Restructuring Reserve [Roll Forward]          
Balance at beginning of period     4.2    
Charges for work-force reductions / Additional provisions     6.0   27.9
Utilized     (5.7)   (23.7)
Changes in estimates and revisions     (0.6)    
Balance at end of period 3.9   3.9   4.2
Work-force reduction costs | United States | 2016 remaining six months          
Restructuring Reserve [Roll Forward]          
Expected future utilization 3.9   3.9    
Work-force reduction costs | Non-US          
Restructuring Reserve [Roll Forward]          
Balance at beginning of period     28.8    
Charges for work-force reductions / Additional provisions     26.2   50.9
Utilized     (24.5)   (21.6)
Changes in estimates and revisions     (3.0)    
Translation adjustments     1.1   (0.5)
Balance at end of period 28.6   28.6   $ 28.8
Work-force reduction costs | Non-US | 2016 remaining six months          
Restructuring Reserve [Roll Forward]          
Expected future utilization 25.8   25.8    
Work-force reduction costs | Non-US | Beyond 2016          
Restructuring Reserve [Roll Forward]          
Expected future utilization $ 2.8   $ 2.8