Debt (Details) - USD ($) $ in Millions				9 Months Ended
	Apr. 01, 2020	Mar. 23, 2020	Feb. 19, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Short-Term Borrowings [Abstract]
Short-term debt				$ 23.6		$ 10.1
Long-Term Debt [Abstract]
Long-term debt, carrying amount				5,774.4		5,122.8
Unamortized premium (discount), net				(4.6)		0.8
Unamortized debt issuance costs				(27.6)		(20.0)
Unamortized deferred gain from settlement of interest rate swaps				19.3		30.7
Long-term debt, total				5,761.5		5,134.3
Long-term debt, current portion				0.0		(602.4)
Long-Term Debt				5,761.5		4,531.9
Proceeds from borrowings				1,186.6	$ 1,112.4
Credit Facility [Member]
Credit Facilities [Abstract]
Credit Facilities, maximum borrowing capacity				$ 2,500.0
Credit Facilities, expiration date				Feb. 14, 2025
Credit Facilities, amount outstanding				$ 0.0
Credit Facilities, covenant terms				The Credit Facility and the 364 Day Credit Facility each contain a financial covenant that requires us to maintain a Leverage Ratio of consolidated indebtedness to consolidated EBITDA of no more than 3.5 times for the most recently ended 12-month period (EBITDA is defined as earnings before interest, taxes, depreciation, amortization and non-cash charges).
Credit Facilities, covenant compliance				at September 30, 2020, we were in compliance with this covenant as our Leverage Ratio was 2.9 times.
Commercial Paper [Member]
Credit Facilities [Abstract]
Credit Facilities, current borrowing capacity				$ 2,000.0
Credit Facilities, amount outstanding				0.0
364 Day Credit Facility [Member]
Credit Facilities [Abstract]
Credit Facilities, maximum borrowing capacity				$ 400.0
Credit Facilities, expiration date				Apr. 02, 2021
Credit Facilities, amount outstanding				$ 0.0
Credit Facilities, covenant terms				The Credit Facility and the 364 Day Credit Facility each contain a financial covenant that requires us to maintain a Leverage Ratio of consolidated indebtedness to consolidated EBITDA of no more than 3.5 times for the most recently ended 12-month period (EBITDA is defined as earnings before interest, taxes, depreciation, amortization and non-cash charges).
Credit Facilities, covenant compliance				at September 30, 2020, we were in compliance with this covenant as our Leverage Ratio was 2.9 times.
Uncommitted credit lines [Member]
Credit Facilities [Abstract]
Credit Facilities, current borrowing capacity				$ 1,000.0
Credit Facilities, amount outstanding				0.0
4.45% Senior Notes due 2020
Long-Term Debt [Abstract]
Long-term debt, carrying amount				$ 0.0		600.0
Long-term debt, interest rate				4.45%
Extinguishment of Debt, Amount		$ 600.0
Loss on extinguishment of debt		$ 7.7
3.625% Senior Notes due 2022
Long-Term Debt [Abstract]
Long-term debt, carrying amount				$ 1,250.0		1,250.0
Long-term debt, interest rate				3.625%
3.65% Senior Notes due 2024
Long-Term Debt [Abstract]
Long-term debt, carrying amount				$ 750.0		750.0
Long-term debt, interest rate				3.65%
3.60% Senior Notes due 2026
Long-Term Debt [Abstract]
Long-term debt, carrying amount				$ 1,400.0		1,400.0
Long-term debt, interest rate				3.60%
0.80% Euro Notes due 2027
Long-Term Debt [Abstract]
Long-term debt, carrying amount				$ 587.2		561.4
Long-term debt, interest rate				0.80%
2.45% Senior Notes due 2030
Long-Term Debt [Abstract]
Long-term debt, carrying amount			$ 600.0	$ 600.0		0.0
Long-term debt, interest rate			2.45%	2.45%
Proceeds from borrowings			$ 592.6
4.20% Senior Notes due 2030
Long-Term Debt [Abstract]
Long-term debt, carrying amount	$ 600.0			$ 600.0		0.0
Long-term debt, interest rate	4.20%
Proceeds from borrowings	$ 592.5
1.40% Euro Notes due 2031
Long-Term Debt [Abstract]
Long-term debt, carrying amount				$ 587.2		$ 561.4
Long-term debt, interest rate				1.40%