Contractual interest rate for funds borrowed, under the debt agreement.

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Financing - Components of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jun. 20, 2016
Debt Instrument [Line Items]
Long-term debt	$ 3,430.3	$ 4,056.2
Less: Current portion of long-term debt	455.6	0.0
Long-term debt, net of current maturities	2,974.7	4,056.2
Commercial Paper
Debt Instrument [Line Items]
Long-term debt	663.3
U.S. dollar-denominated commercial paper \| Commercial Paper
Debt Instrument [Line Items]
Long-term debt	390.1	665.1
Euro-denominated commercial paper \| Commercial Paper
Debt Instrument [Line Items]
Long-term debt	270.1	282.7
U.S. dollar variable interest rate term loan due 2019 \| Line of Credit
Debt Instrument [Line Items]
Long-term debt	0.0	500.0
Delayed-Draw Term Loan \| Line of Credit
Debt Instrument [Line Items]
Long-term debt	400.0	0.0
Yen variable interest rate term loan due 2022 \| Line of Credit
Debt Instrument [Line Items]
Long-term debt	125.7	122.4
1.80% senior unsecured notes due 2019 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	55.6	298.9
Interest rate			1.80%
2.35% senior unsecured notes due 2021 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	747.0	745.9
Interest rate			2.35%
3.15% senior unsecured notes due 2026 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	891.9	891.0
Interest rate			3.15%
4.30% senior unsecured notes due 2046 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt	546.9	546.8
Interest rate			4.30%
Other
Debt Instrument [Line Items]
Long-term debt	$ 3.0	$ 3.4