Debt (Schedule of Short-Term and Long-Term Debt) (Details) € in Millions, ¥ in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 JPY (¥)	Dec. 31, 2018 USD ($)
Long-term Debt
Long-term debt		$ 3,743.2			$ 3,826.8
€350.0 million fixed rate notes due March 2019 [Member]
Long-term Debt
Debt instrument, face amount | €			€ 350.0
Debt Instrument, maturity date		Mar. 31, 2019
Debt Instrument, Interest Rate, Stated Percentage		3.13%	3.13%	3.13%
¥19.1 billion term loan due March 2019 [Member]
Long-term Debt
Debt instrument, face amount | ¥				¥ 19,100.0
Debt Instrument, maturity date		Mar. 31, 2019
Debt Instrument, Interest Rate, Stated Percentage		0.81%	0.81%	0.81%
$750.0 million Fixed Rate Notes Due September 2022 Interest Equal To 3.00% [Member]
Long-term Debt
Long-term debt	[1]	$ 747.7			746.9
Debt instrument, face amount		$ 750.0
Debt Instrument, maturity date		Sep. 01, 2022
Debt Instrument, Interest Rate, Stated Percentage		3.00%	3.00%	3.00%
Debt Instrument, Interest Rate During Period		3.32%
€15.0 million fixed rate notes due May 2023 [Member]
Long-term Debt
Long-term debt		$ 16.4			16.6
Debt instrument, face amount | €			€ 15.0
Debt Instrument, maturity date		May 31, 2023
Debt Instrument, Interest Rate, Stated Percentage		4.30%	4.30%	4.30%
$750.0 Million Fixed Rate Notes Due March 2025, Interest Equal To 3.00% [Member]
Long-term Debt
Long-term debt	[2]	$ 746.3			745.6
Debt instrument, face amount		$ 750.0
Debt Instrument, maturity date		Mar. 01, 2025
Debt Instrument, Interest Rate, Stated Percentage		3.00%	3.00%	3.00%
Debt Instrument, Interest Rate During Period		3.11%
$500.0 Million Fixed Rate Notes Due June 2028, Interest Equal To 3.75% [Member] [Domain]
Long-term Debt
Long-term debt		$ 496.4			495.9
Debt instrument, face amount		$ 500.0
Debt Instrument, maturity date		Jun. 15, 2028
Debt Instrument, Interest Rate, Stated Percentage		3.75%	3.75%	3.75%
$750.0 million Fixed Rate Notes Due September 2043 Interest Equal To 5.3% [Member]
Long-term Debt
Long-term debt	[3]	$ 742.8			742.4
Debt instrument, face amount		$ 750.0
Debt Instrument, maturity date		Sep. 01, 2043
Debt Instrument, Interest Rate, Stated Percentage		5.30%	5.30%	5.30%
Debt Instrument, Interest Rate During Period		4.73%
$700.0 Million Fixed Rate Notes Due June 2048, Interest Equal To 4.15% [Member] [Domain] [Domain]
Long-term Debt
Long-term debt		$ 689.8			689.5
Debt instrument, face amount		$ 700.0
Debt Instrument, maturity date		Jun. 15, 2048
Debt Instrument, Interest Rate, Stated Percentage		4.15%	4.15%	4.15%
Commercial Paper [Member]
Long-term Debt
Long-term debt	[4]	$ 303.8			$ 389.9

[1] The company maintained a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 3.32%.

[2] The company maintained a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 3.11%.

[3] The company maintained a forward-starting interest rate swap agreement that modified the interest obligation associated with these notes so that the interest payable on the notes effectively became fixed at a rate of 4.73%

[4] The commercial paper is backed by the five-year multi-currency revolving credit facility