Debt (Details) € in Millions, $ in Millions				9 Months Ended
	Aug. 01, 2019 USD ($)	Jul. 15, 2019 USD ($)	Jul. 08, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 EUR (€)	Sep. 30, 2019 USD ($)	Jul. 08, 2019 EUR (€)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Credit Facilities [Abstract]
Available and unused credit lines							$ 3,766.4			$ 3,731.6
Short-Term Borrowings [Abstract]
Short-term debt							7.9			8.1
Long-Term Debt [Abstract]
Long-term debt, carrying amount							5,095.2			4,900.0
Unamortized premium (discount), net							1.2			4.9
Unamortized debt issuance costs							(20.8)			(16.4)
Unamortized deferred gain from settlement of interest rate swaps							34.8			48.0
Fair value adjustment attributed to outstanding interest rate swaps							0.0			(52.8)
Long-term debt, total							5,110.4			4,883.7
Long-term debt, current portion							(603.4)			(499.6)
Long-Term Debt							4,507.0			4,384.1
Repayment of debt				$ 900.0	$ 0.0
Proceeds from borrowings			$ 1,100.0	$ 1,112.4	$ 0.0
Interest Rate Swaps on 2024 Notes and 2026 Notes [Member]
Long-Term Debt [Abstract]
Unamortized deferred gain from settlement of interest rate swaps	$ (3.3)
Interest Rate Swaps on 2024 Notes [Member]
Long-Term Debt [Abstract]
Interest rate swaps, notional amount									$ 750.0
Interest Rate Swaps on 2026 Notes [Member]
Long-Term Debt [Abstract]
Interest rate swaps, notional amount									500.0
Credit Facility
Credit Facilities [Abstract]
Credit Facility, maximum borrowing capacity							2,500.0
Credit Facility, expiration date				Jul. 31, 2021
Available and unused credit lines							2,500.0			2,500.0
Credit Facility, covenant terms				The Credit Facility contains financial covenants that require us to maintain a Leverage Ratio of consolidated indebtedness to consolidated EBITDA of no more than 3 times for the most recently ended 12-month period (EBITDA is defined as earnings before interest, taxes, depreciation and amortization) and an Interest Coverage Ratio of consolidated EBITDA to interest expense of at least 5 times for the most recently ended 12-month period.
Credit Facility, covenant compliance				At September 30, 2019 we were in compliance with these covenants as our Leverage Ratio was 2.2 times and our Interest Coverage Ratio was 9.6 times.
Commercial Paper [Member]
Credit Facilities [Abstract]
Credit Facility, maximum borrowing capacity							2,000.0
Uncommitted credit lines
Credit Facilities [Abstract]
Available and unused credit lines							1,266.4			1,231.6
Short-term Senior Notes
Short-Term Borrowings [Abstract]
Short-term debt | €						€ 520
6.25% Senior Notes due 2019
Long-Term Debt [Abstract]
Long-term debt, carrying amount							$ 0.0			500.0
Long-term debt, interest rate						6.25%	6.25%
Long-term debt, maturity date				Jul. 15, 2019
Repayment of debt		$ 500.0
4.45% Senior Notes due 2020
Long-Term Debt [Abstract]
Long-term debt, carrying amount							$ 600.0		$ 1,000.0	1,000.0
Long-term debt, interest rate						4.45%	4.45%
Long-term debt, maturity date				Aug. 15, 2020
Extinguishment of Debt, Amount	400.0
Gain (Loss) on Extinguishment of Debt	$ 6.3
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%	3.625%
Long-term debt, maturity date				May 01, 2022
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%	3.65%
Long-term debt, maturity date				Nov. 01, 2024
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%	3.60%
Long-term debt, maturity date				Apr. 15, 2026
0.800% Senior Notes due 2027
Long-Term Debt [Abstract]
Long-term debt, carrying amount							$ 547.6	€ 500		0.0
Long-term debt, interest rate						0.80%	0.80%	0.80%
Long-term debt, maturity date			Jul. 08, 2027	Jul. 08, 2027
1.400% Senior Notes due 2031
Long-Term Debt [Abstract]
Long-term debt, carrying amount							$ 547.6	€ 500		$ 0.0
Long-term debt, interest rate						1.40%	1.40%	1.40%
Long-term debt, maturity date			Jul. 08, 2031	Jul. 08, 2031