Summary of Short-Term Borrowings and Long-Term Debt (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2018	Dec. 31, 2017
Short-term borrowings
Commercial paper issuances	$ 251.4	$ 268.7
Various debt due to international banks	2.1	2.2
Total short-term borrowings	253.5	270.9
Long-term debt
Debt issuance costs, net	(15.7)	(15.5)
Fair value adjustment asset (liability) related to hedged fixed rate debt instrument	(4.1)	(2.2)
Total long-term debt	2,101.3	2,103.4
Less: current maturities	(299.2)	0.0
Net long-term debt	1,802.1	2,103.4
Floating Rate Senior notes due January 25, 2019
Long-term debt
Senior notes	300.0	300.0
2.45% Senior notes due December 15, 2019
Long-term debt
Senior notes	300.0	300.0
Less: Discount	(0.1)	(0.1)
2.45% Senior notes due August 1, 2022
Long-term debt
Senior notes	300.0	300.0
Less: Discount	(0.3)	(0.3)
2.875% Senior notes due October 1, 2022
Long-term debt
Senior notes	400.0	400.0
Less: Discount	(0.2)	(0.2)
3.15% Senior notes due August 1, 2027
Long-term debt
Senior notes	425.0	425.0
Less: Discount	(0.4)	(0.4)
3.95% Senior notes due August 1, 2047
Long-term debt
Senior notes	400.0	400.0
Less: Discount	$ (2.9)	$ (2.9)

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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