Subsequent Events (Details)	Feb. 25, 2021 USD ($)	Feb. 16, 2021 USD ($)	Jan. 29, 2021 EUR (€)	Jan. 29, 2021 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 USD ($)	Mar. 31, 2020	Dec. 31, 2019 USD ($)	Jan. 17, 2017 USD ($)
Senior notes | 3.45% Senior Notes due 2022
Subsequent Event [Line Items]
Long-term Debt, Gross						$ 500,000,000.0		$ 500,000,000.0
Debt Instrument, Interest Rate, Stated Percentage					3.45%	3.45%	3.45%	3.45%
Synthetic bonds due 2021
Subsequent Event [Line Items]
Long-term Debt, Gross						$ 551,200,000		$ 492,900,000
Commercial paper
Subsequent Event [Line Items]
Long-term Debt, Gross						1,525,900,000		$ 1,967,000,000.0
Commercial paper | U.S. dollar
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity						1,500,000,000
Subsequent Event | Senior notes
Subsequent Event [Line Items]
Long-term Debt, Gross				$ 1,000,000,000.0
Debt Instrument, Interest Rate, Stated Percentage			650.00%	650.00%
Subsequent Event | Senior notes | 3.45% Senior Notes due 2022
Subsequent Event [Line Items]
Long-term Debt, Gross				$ 500,000,000.0
Debt Instrument, Interest Rate, Stated Percentage			3.45%	3.45%
Subsequent Event | Synthetic bonds due 2021
Subsequent Event [Line Items]
Long-term Debt, Gross				$ 522,800,000
Subsequent Event | Commercial paper | U.S. dollar
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity						$ 1,525,900,000
Revolving credit facility | Line of Credit
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity					€ 500,000,000				$ 2,500,000,000
Revolving credit facility | Subsequent Event
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,000,000,000.0
Line of Credit Facility, Current Borrowing Capacity	$ 800,000,000
Revolving credit facility | Subsequent Event | Line of Credit
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity			€ 500,000,000.0	$ 2,500,000,000