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Debt (Short-Term Borrowings and Current Portion of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Commercial Paper	$ 99.6us-gaap_CommercialPaper	$ 544.8us-gaap_CommercialPaper
Long-term debt, current maturities	506.3us-gaap_LongTermDebtCurrent	0us-gaap_LongTermDebtCurrent
Total	$ 605.9us-gaap_DebtCurrent	$ 544.8us-gaap_DebtCurrent

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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