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Debt - Short-term Borrowings (Details)			12 Months Ended
	Jul. 19, 2018 USD ($) option	May 06, 2016	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Short Term Debt [Line Items]
Short-term borrowings outstanding			$ 633,700,000	$ 204,700,000	$ 328,400,000
Domestic Commercial Paper Program | Commercial Paper
Short Term Debt [Line Items]
Short-term borrowings outstanding			$ 274,800,000	$ 191,900,000	$ 291,400,000
Weighted average interest rate			1.90%	2.10%	3.00%
Five Year Credit Agreement, July 2018 | Line of Credit
Short Term Debt [Line Items]
Maximum borrowing capacity	$ 2,000,000,000.000
Number of extension options | option	2
Extension term	1 year
Maximum borrowing capacity after exercising extension option	$ 2,750,000,000
Short-term borrowings outstanding				$ 0	$ 0
Five Year Credit Agreement, July 2018 | Letter of Credit
Short Term Debt [Line Items]
Maximum borrowing capacity	$ 250,000,000.0
Five Year Credit Agreement, July 2018 | Line of Credit
Short Term Debt [Line Items]
Debt instrument term			5 years
Foreign Programs
Short Term Debt [Line Items]
Short-term borrowings outstanding			$ 9,000,000.0	$ 12,800,000	$ 37,000,000.0
Weighted average interest rate			3.20%	4.30%	9.30%
Five Year Credit Agreement, September 2017 | Line of Credit
Short Term Debt [Line Items]
Debt instrument term			5 years
Maximum borrowing capacity				$ 625,000,000.0
Five Year Credit Agreement, May 2016 | Line of Credit
Short Term Debt [Line Items]
Debt instrument term		5 years
Five Year Credit Agreement, May 2016 | Letter of Credit
Short Term Debt [Line Items]
Maximum borrowing capacity				875,000,000.0
Short-term borrowings outstanding			$ 350,000,000.0	$ 0	$ 0

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 210
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- Definition

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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