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Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financial Instruments
Preferred Stock	$ 30.4us-gaap_PreferredStockValue	$ 30.4us-gaap_PreferredStockValue
Long-term debt including current portion, carrying value	4,552.4us-gaap_LongTermDebt	4,626.7us-gaap_LongTermDebt
Long-term debt including current portion, fair value	5,126.0us-gaap_DebtInstrumentFairValue	4,911.8us-gaap_DebtInstrumentFairValue
Fair Value [Member]
Financial Instruments
Preferred Stock	27.1	26.0
Carrying Amount [Member]
Financial Instruments
Preferred Stock	$ 30.4	$ 30.4

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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