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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Debt - Long-term Borrowings (Details) € in Millions	1 Months Ended		12 Months Ended
Debt - Long-term Borrowings (Details) € in Millions	Aug. 31, 2019 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2019 USD ($)	Aug. 31, 2017 EUR (€)	Jun. 02, 2017 USD ($)	May 16, 2017 USD ($)	Apr. 30, 2016 USD ($)
Debt Instrument [Line Items]
Long-term debt maturing in 2020			$ 430,100,000
Long-term debt maturing in 2021			275,200,000
Long-term debt maturing in 2022			1,160,400,000
Long-term debt maturing in 2023			300,000
Long-term debt maturing in 2024			500,100,000
Interest expense on long-term debt			321,300,000	$ 343,100,000	$ 257,400,000
Loss on extinguishment of debt			14,800,000
Interest Expense
Debt Instrument [Line Items]
Reduction in interest expense due to amortization of unrealized gain			$ 7,800,000
Reduction in interest expense due to amortization of unrealized gain				$ 8,300,000
Designated as Hedging Instrument \| Cash Flow Hedging \| Interest Rate Contract
Debt Instrument [Line Items]
Derivative pretax gain recognized in OCI		$ 87,600,000
Bridge Loan \| Committed Acquisition Financing
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 7,300,000,000
Senior Notes \| 2.25% Senior Notes Due May 2020
Debt Instrument [Line Items]
Debt repurchased	$ 1,010,000,000.000					$ 60,900,000
Interest rate	2.25%					2.25%
Loss on extinguishment of debt	$ 14,800,000
Senior Notes \| Senior Notes 2.75%, Due June 2022
Debt Instrument [Line Items]
Debt repurchased	$ 490,000,000.0
Interest rate	2.75%
Senior Notes \| 2.95% Senior Notes
Debt Instrument [Line Items]
Interest rate	2.95%		2.95%
Long-term debt issued	$ 800,000,000.0
Senior Notes \| 3.80% Senior Notes
Debt Instrument [Line Items]
Interest rate	3.80%		3.80%
Long-term debt issued	$ 550,000,000.0
Senior Notes \| New Notes
Debt Instrument [Line Items]
Long-term debt issued									$ 6,000,000,000.0
Senior Notes \| Exchange Notes
Debt Instrument [Line Items]
Long-term debt issued								$ 1,478,000,000
Debentures \| Floating Rate Loan
Debt Instrument [Line Items]
Long-term debt issued \| €							€ 225.0
Debentures \| 0.92% Fixed Rate Loan
Debt Instrument [Line Items]
Interest rate			0.92%				0.92%
Long-term debt issued \| €							€ 20.0
Term Loan \| Committed Acquisition Financing
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 2,000,000,000.0