Debt (Details) € in Millions, $ in Millions				12 Months Ended
	Apr. 01, 2020 USD ($)	Mar. 23, 2020 USD ($)	Feb. 19, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 EUR (€)
Short-Term Borrowings [Abstract]
Short-term debt				$ 3.9	$ 10.1
Short-term borrowings, weighted average interest rate				3.50%	2.50%		3.50%
Long-Term Debt [Abstract]
Long-term debt, carrying amount				$ 5,823.0	$ 5,122.8
Unamortized premium (discount), net				(5.1)	0.8
Unamortized debt issuance costs				(27.0)	(20.0)
Unamortized deferred gain from settlement of interest rate swaps				16.4	30.7
Long-term debt, total				5,807.3	5,134.3
Long-term debt, current portion				0.0	(602.4)
Long-Term Debt				5,807.3	4,531.9
Repayment of debt				600.0	900.0	$ 0.0
Proceeds from borrowings				1,186.6	1,112.4	0.0
Contractual Maturities of Long-Term Debt [Abstract]
Contractual maturities of long-term debt, 2021				0.0
Contractual maturities of long-term debt, 2022				1,250.0
Contractual maturities of long-term debt, 2023				0.0
Contractual maturities of long-term debt, 2024				750.0
Contractual maturities of long-term debt, 2025				0.0
Contractual maturities of long-term debt, Thereafter				3,823.0
Contractual maturities of long-term debt				5,823.0
Components of Interest Expense [Abstract]
Interest expense, Long-term debt				186.4	194.6	201.6
Interest expense, Commercial paper				0.9	6.5	9.6
Interest expense, Interest rate swaps				0.0	6.1	5.2
Interest expense, Amortization of deferred gain on interest rate swaps				(8.1)	(14.8)	(12.9)
Interest expense, Fees				6.5	4.7	5.6
Interest expense, Pension and other interest				36.1	47.2	57.3
Interest expense, total				221.8	244.3	$ 266.4
Credit Facility [Member]
Credit Facilities [Abstract]
Credit Facilities, maximum borrowing capacity				$ 2,500.0
Credit Facilities, expiration date				Feb. 14, 2025
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 (earnings before interest, taxes, depreciation, amortization and non-cash charges) of no more than 3.5 times for the most recently ended 12-month period. On October 26, 2020, we amended the Credit Facility and the 364 Day Credit Facility to provide additional flexibility with respect to the Leverage Ratio covenant. The amendments increase the maximum Leverage Ratio to 4.0 times through December 31, 2021 for the Credit Agreement and to 4.0 times through the maturity for the 364 Day Credit Facility.
Credit Facilities, covenant compliance				At December 31, 2020, we were in compliance with these covenants as our Leverage Ratio was 3.0 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, 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 (earnings before interest, taxes, depreciation, amortization and non-cash charges) of no more than 3.5 times for the most recently ended 12-month period. On October 26, 2020, we amended the Credit Facility and the 364 Day Credit Facility to provide additional flexibility with respect to the Leverage Ratio covenant. The amendments increase the maximum Leverage Ratio to 4.0 times through December 31, 2021 for the Credit Agreement and to 4.0 times through the maturity for the 364 Day Credit Facility.
Credit Facilities, covenant compliance				At December 31, 2020, we were in compliance with these covenants as our Leverage Ratio was 3.0 times.
Uncommitted credit lines [Member]
Credit Facilities [Abstract]
Credit Facilities, current borrowing capacity				$ 1,100.0
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%			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%			3.625%
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%			3.65%
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%			3.60%
€500 Million 0.80% Senior Notes due 2027
Long-Term Debt [Abstract]
Long-term debt, carrying amount				$ 611.5	561.4		€ 500.0
Long-term debt, interest rate				0.80%			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%			2.45%
Long-term debt, maturity date			Apr. 30, 2030
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
€500 Million 1.40% Senior Notes due 2031
Long-Term Debt [Abstract]
Long-term debt, carrying amount				$ 611.5	$ 561.4		€ 500.0
Long-term debt, interest rate				1.40%			1.40%