Financing and Capital - Components of Debt (Details) - USD ($) $ in Millions	Sep. 27, 2019	Mar. 29, 2019	Feb. 22, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt	$ 6,015.6			$ 3,430.3
Current portion of long-term debt	1,000.0			455.6
Long-term debt, net of current maturities	5,015.6			2,974.7
Other
Debt Instrument [Line Items]
Long-term debt	19.2			3.0
Commercial Paper | U.S. dollar-denominated commercial paper
Debt Instrument [Line Items]
Long-term debt	1,086.0			390.1
Commercial Paper | Euro-denominated commercial paper
Debt Instrument [Line Items]
Long-term debt	257.7			270.1
Senior Notes | 1.80% senior unsecured notes due 2019
Debt Instrument [Line Items]
Long-term debt	$ 0.0			$ 55.6
Interest rate, stated percentage	1.80%			1.80%
Senior Notes | 2.35% senior unsecured notes due 2021
Debt Instrument [Line Items]
Long-term debt	$ 747.9			$ 747.0
Interest rate, stated percentage	2.35%
Senior Notes | 3.15% senior unsecured notes due 2026
Debt Instrument [Line Items]
Long-term debt	$ 892.8			891.9
Interest rate, stated percentage	3.15%
Senior Notes | 4.30% senior unsecured notes due 2046
Debt Instrument [Line Items]
Long-term debt	$ 547.0			546.9
Interest rate, stated percentage	4.30%
Convertible Debt | 0.875% senior convertible notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 1,337.1			0.0
Interest rate, stated percentage	0.875%	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	$ 127.9			$ 125.7