Financing and Capital - Components of Debt (Details) - USD ($) $ in Millions	Mar. 29, 2019	Feb. 22, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt	$ 5,783.7		$ 3,430.3
Current portion of long-term debt	1,055.4		455.6
Long-term debt, net of current maturities	4,728.3		2,974.7
Other
Debt Instrument [Line Items]
Long-term debt	2.4		3.0
Commercial Paper | U.S. dollar-denominated commercial paper
Debt Instrument [Line Items]
Long-term debt	834.0		390.1
Commercial Paper | Euro-denominated commercial paper
Debt Instrument [Line Items]
Long-term debt	264.2		270.1
Senior Notes | 1.80% senior unsecured notes due 2019
Debt Instrument [Line Items]
Long-term debt	$ 55.4		55.6
Interest rate, stated percentage	1.80%
Senior Notes | 2.35% senior unsecured notes due 2021
Debt Instrument [Line Items]
Long-term debt	$ 747.3		747.0
Interest rate, stated percentage	2.35%
Senior Notes | 3.15% senior unsecured notes due 2026
Debt Instrument [Line Items]
Long-term debt	$ 892.2		891.9
Interest rate, stated percentage	3.15%
Senior Notes | 4.30% senior unsecured notes due 2046
Debt Instrument [Line Items]
Long-term debt	$ 546.9		546.9
Interest rate, stated percentage	4.30%
Convertible Debt | 0.875% senior convertible notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 1,316.9		0.0
Interest rate, stated percentage	0.875%	0.875%
Line of credit | Delayed-draw term loan due 2019
Debt Instrument [Line Items]
Long-term debt	$ 0.0		400.0
Line of credit | Delayed-draw term loan due 2020
Debt Instrument [Line Items]
Long-term debt	1,000.0		0.0
Line of credit | Yen variable interest rate term loan due 2022
Debt Instrument [Line Items]
Long-term debt	$ 124.4		$ 125.7