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Debt (Summary of Senior Notes) (Details) - Senior Notes
$ in Millions
Jun. 30, 2020
USD ($)
Debt Instrument [Line Items]  
Carrying amount $ 4,923.4
Payable in U.S. Dollars  
Debt Instrument [Line Items]  
Carrying amount 3,800.0
Payable in U.S. Dollars | Note 1.50%  
Debt Instrument [Line Items]  
Carrying amount $ 550.0
Interest rate (percent) 1.50%
Payable in U.S. Dollars | Note 1.85%  
Debt Instrument [Line Items]  
Carrying amount $ 650.0
Interest rate (percent) 1.85%
Payable in U.S. Dollars | Note 2.05%  
Debt Instrument [Line Items]  
Carrying amount $ 900.0
Interest rate (percent) 2.05%
Payable in U.S. Dollars | Note 2.70%  
Debt Instrument [Line Items]  
Carrying amount $ 750.0
Interest rate (percent) 2.70%
Payable in U.S. Dollars | Note 2.80%  
Debt Instrument [Line Items]  
Carrying amount $ 950.0
Interest rate (percent) 2.80%
Payable in Euro  
Debt Instrument [Line Items]  
Carrying amount $ 1,123.4
Payable in Euro | Eurobonds 0.50%  
Debt Instrument [Line Items]  
Carrying amount $ 561.7
Interest rate (percent) 0.50%
Payable in Euro | Eurobonds 0.80%  
Debt Instrument [Line Items]  
Carrying amount $ 561.7
Interest rate (percent) 0.80%