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Stockholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 14,181.3 $ 11,384.4 $ 1,826.4
Total other comprehensive income (loss), net of tax (87.1) 281.7 (211.0)
Ending balance 5,277.8 14,181.3 11,384.4
Cumulative Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (318.8) (607.9)  
Other comprehensive (loss) income before reclassifications (203.0) 201.7  
Amounts reclassified to earnings 29.2 87.4  
Total other comprehensive income (loss), net of tax (173.8) 289.1  
Ending balance (492.6) (318.8) (607.9)
Pension and Postretirement Costs [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (385.5) (400.0)  
Other comprehensive (loss) income before reclassifications 29.1 6.6  
Amounts reclassified to earnings 12.8 7.9  
Total other comprehensive income (loss), net of tax 41.9 14.5  
Reclassification to retained earnings (54.5)    
Ending balance (398.1) (385.5) (400.0)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (58.8) (36.9)  
Other comprehensive (loss) income before reclassifications 14.6 (27.8)  
Amounts reclassified to earnings 30.2 5.9  
Total other comprehensive income (loss), net of tax 44.8 (21.9)  
Reclassification to retained earnings (8.1)    
Ending balance (22.1) (58.8) (36.9)
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (763.1) (1,044.8) (833.8)
Other comprehensive (loss) income before reclassifications (159.3) 180.5  
Amounts reclassified to earnings 72.2 101.2  
Total other comprehensive income (loss), net of tax (87.1) 281.7  
Reclassification to retained earnings (62.6)    
Ending balance $ (912.8) $ (763.1) $ (1,044.8)