Summary of Short-Term Borrowings and Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Short-term borrowings
Commercial paper issuances	$ 143.3us-gaap_CommercialPaper	$ 150.0us-gaap_CommercialPaper
Various debt due to international banks	3.4	3.8
Total short-term borrowings	146.7us-gaap_ShortTermBorrowings	153.8us-gaap_ShortTermBorrowings
Long-term debt
Fair value adjustment related to hedged fixed rate debt instrument	(0.9)	0
Total long-term debt	948.5us-gaap_LongTermDebt	649.5us-gaap_LongTermDebt
Less: current maturities	(249.9)us-gaap_LongTermDebtCurrent	0us-gaap_LongTermDebtCurrent
Senior Notes	698.6us-gaap_LongTermDebtNoncurrent	649.5us-gaap_LongTermDebtNoncurrent
2.875% Senior notes due October 1, 2022
Long-term debt
Senior notes	400.0	400.0	400.0
Less: Discount	(0.3)	(0.3)
3.35% Senior notes due December 15, 2015
Long-term debt
Senior notes	250.0	250.0
Less: Discount	(0.1)	(0.2)
2.45% Senior notes due December 15, 2019
Long-term debt
Senior notes	300.0	0
Less: Discount	$ (0.2)	$ 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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