Summary of Short-Term Borrowings and Long-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Short-term borrowings
Commercial paper issuances	$ 268.7	$ 420.0
Various debt due to international banks	2.2	6.8
Total short-term borrowings	270.9	426.8
Long-term debt
Debt issuance costs, net	(15.5)	(6.5)
Fair value adjustment related to hedged fixed rate debt instrument	(2.2)	0.2
Net long-term debt	2,103.4	693.4
Floating Rate Senior notes due January 25, 2019
Long-term debt
Senior notes	300.0	0.0
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	0.0
Less: Discount	(0.3)	0.0
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	0.0
Less: Discount	(0.4)	0.0
3.95% Senior notes due August 1, 2047
Long-term debt
Senior notes	400.0	0.0
Less: Discount	$ (2.9)	$ 0.0

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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