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Debt (Summary of Long-Term Debt) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Nov. 22, 2016
Jun. 09, 2016
Dec. 09, 2015
Dec. 24, 2013
Nov. 13, 2013
Jun. 18, 2013
Debt Instrument [Line Items]                
Current portion of long-term debt $ 2,265.2 $ 1,749.2            
Unamortized debt issuance expense (67.1) (71.9)            
Long-term debt 12,451.4 12,865.3            
Other Current Portion of Long-term Debt                
Debt Instrument [Line Items]                
Current portion of long-term debt 2.7 2.4            
2016 Term Loans                
Debt Instrument [Line Items]                
Long-term debt $ 100.0 100.0            
Long-term Debt, Weighted Average Interest Rate, at Point in Time 3.252%              
Other                
Debt Instrument [Line Items]                
Long-term debt $ 6.9 6.3            
Senior Notes | 2018 Senior Notes (2.600% coupon)                
Debt Instrument [Line Items]                
Stated percentage rate               2.60%
Equivalent percentage of redeemed amount 100.00%              
Basis spread on variable rate 0.30%              
Senior Notes | 2018 Senior Notes (3.000% coupon)                
Debt Instrument [Line Items]                
Stated percentage rate         3.00%      
Current portion of long-term debt $ 499.8 499.8            
Equivalent percentage of redeemed amount 100.00%              
Basis spread on variable rate 0.30%              
Senior Notes | 2019 Senior Notes (2.500% coupon)                
Debt Instrument [Line Items]                
Stated percentage rate       2.50%        
Long-term debt $ 999.5 999.5            
Equivalent percentage of redeemed amount 100.00%              
Basis spread on variable rate 0.25%              
Senior Notes | 2019 Senior Notes (2.550% coupon)                
Debt Instrument [Line Items]                
Stated percentage rate             2.55%  
Long-term debt $ 499.8 0.0            
Long-term debt $ 0.0 499.7            
Equivalent percentage of redeemed amount 100.00%              
Basis spread on variable rate 0.20%              
Senior Notes | 2020 Floating Rate Euro Notes [Domain]                
Debt Instrument [Line Items]                
Long-term debt $ 616.2 600.2            
Basis spread on variable rate 0.50%              
Senior Notes | 2020 Euro Senior Notes                
Debt Instrument [Line Items]                
Stated percentage rate     1.25%          
Long-term debt $ 921.7 897.6            
Senior Notes | 2020 Senior Notes (3.750% coupon)                
Debt Instrument [Line Items]                
Stated percentage rate         3.75%      
Long-term debt $ 499.9 499.9            
Equivalent percentage of redeemed amount 100.00%              
Basis spread on variable rate 0.35%              
Senior Notes | 2021 Senior Notes (3.150% coupon)                
Debt Instrument [Line Items]                
Stated percentage rate       3.15%        
Long-term debt $ 2,248.3 2,248.2            
Equivalent percentage of redeemed amount 100.00%              
Basis spread on variable rate 0.30%              
Senior Notes | 2023 Senior Notes (3.125% coupon)                
Debt Instrument [Line Items]                
Stated percentage rate           3.125%    
Long-term debt $ 749.4 765.4            
Equivalent percentage of redeemed amount 100.00%              
Basis spread on variable rate 0.20%              
Senior Notes | 2023 Senior Notes (4.200% coupon)                
Debt Instrument [Line Items]                
Stated percentage rate             4.20%  
Long-term debt $ 498.8 498.8            
Equivalent percentage of redeemed amount 100.00%              
Basis spread on variable rate 0.25%              
Senior Notes | 2024 Euro Senior Notes                
Debt Instrument [Line Items]                
Stated percentage rate     2.25%          
Long-term debt $ 1,229.7 1,197.7            
Senior Notes | 2026 Senior Notes (3.950% coupon)                
Debt Instrument [Line Items]                
Stated percentage rate       3.95%        
Long-term debt $ 2,235.3 2,235.0            
Equivalent percentage of redeemed amount 100.00%              
Basis spread on variable rate 0.35%              
Senior Notes | 2028 Euro Senior Notes                
Debt Instrument [Line Items]                
Stated percentage rate     3.125%          
Long-term debt $ 915.9 892.0            
Senior Notes | 2043 Senior Notes (5.400% coupon)                
Debt Instrument [Line Items]                
Stated percentage rate       5.40%        
Long-term debt $ 497.1 497.1            
Equivalent percentage of redeemed amount 100.00%              
Basis spread on variable rate 0.25%              
Senior Notes | 2046 Senior Notes (5.250% coupon)                
Debt Instrument [Line Items]                
Stated percentage rate       5.25%        
Long-term debt $ 999.8 999.8            
Equivalent percentage of redeemed amount 100.00%              
Basis spread on variable rate 0.40%              
Senior Notes | 2018 Floating Rate Euro Notes                
Debt Instrument [Line Items]                
Current portion of long-term debt $ 616.2 600.2            
Basis spread on variable rate 0.87%              
Current Portion of Long-Term Debt                
Debt Instrument [Line Items]                
Unamortized debt issuance expense $ (3.2) (3.1)            
Senior Notes | 2018 Senior Notes (2.600% coupon)                
Debt Instrument [Line Items]                
Current portion of long-term debt $ 649.9 $ 649.9