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Debt (Euro Notes) (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 15, 2018
Apr. 28, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Debt Instrument [Line Items]          
Long-term Debt, Gross     $ 14,542.0    
Repayments of Long-term Debt     $ 2,598.6 $ 1,747.3  
Senior Notes | 2025 Euro Senior Notes [Member]          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.30%    
Long-term Debt     $ 500.0    
Senior Notes | 2018 Floating Rate Euro Notes          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.87%    
Senior Notes | 2020 Floating Rate Euro Notes [Domain]          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.50%    
Senior Notes | 2019 Senior Notes (2.550% coupon)          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.20%    
Equivalent percentage of redeemed amount     100.00%    
Long-term Debt   $ 500.0 $ 549.9   $ 0.0
Repayments of Long-term Debt $ 150.0 $ 350.0      
Senior Notes | 2019 Senior Notes (2.500% coupon)          
Debt Instrument [Line Items]          
Basis spread on variable rate     0.25%    
Equivalent percentage of redeemed amount     100.00%    
Long-term Debt 1,000.0        
Repayments of Long-term Debt $ 450.0