Summary of Short-Term Borrowings and Long-Term Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Short-term borrowings
Commercial paper issuances	$ 248,600,000	$ 0
Various debt due to international banks	4,300,000	1,800,000
Total short-term borrowings	252,900,000	1,800,000
Long-term debt
Debt issuance costs, net	(11,500,000)	(13,100,000)
Fair value adjustment asset (liability) related to hedged fixed rate debt instrument	0.0	(3,000,000.0)
Total long-term debt	1,810,200,000	2,105,300,000
Less: current maturities	(0.0)	(596,500,000)
Net long-term debt	1,810,200,000	1,508,800,000
Floating Rate Senior notes due January 25, 2019
Long-term debt
Senior notes	0.0	300,000,000.0
2.45% Senior notes due December 15, 2019
Long-term debt
Senior notes	0.0	300,000,000.0
2.45% Senior notes due August 1, 2022
Long-term debt
Senior notes	300,000,000.0	300,000,000.0
Less: Discount	(200,000)	(300,000)
2.875% Senior notes due October 1, 2022
Long-term debt
Senior notes	400,000,000.0	400,000,000.0
Less: Discount	(100,000)	(100,000)
Term Loan
Long-term debt
Term loan	300,000,000.0	0.0
3.15% Senior notes due August 1, 2027
Long-term debt
Senior notes	425,000,000.0	425,000,000.0
Less: Discount	(300,000)	(400,000)
3.95% Senior notes due August 1, 2047
Long-term debt
Senior notes	400,000,000.0	400,000,000.0
Less: Discount	$ (2,700,000)	$ (2,800,000)