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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 5,253.2 $ 14,181.3
Net current period other comprehensive loss (23.7) 51.4
Ending balance 4,983.1 14,167.3
Cumulative Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (492.6)  
Other comprehensive loss income before reclassifications (2.1)  
Net current period other comprehensive loss (2.1)  
Ending balance (494.7)  
Pension and Postretirement Costs [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (398.1)  
Other comprehensive loss income before reclassifications (14.8)  
Amounts reclassified to earnings 1.6  
Net current period other comprehensive loss (13.2)  
Ending balance (411.3)  
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (22.1)  
Other comprehensive loss income before reclassifications (5.1)  
Amounts reclassified to earnings (3.3)  
Net current period other comprehensive loss (8.4)  
Ending balance (30.5)  
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (912.8) (763.1)
Other comprehensive loss income before reclassifications (22.0)  
Amounts reclassified to earnings (1.7)  
Net current period other comprehensive loss (23.7)  
Ending balance $ (936.5) $ (711.7)