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Financial Instrument, Risk Management and Fair Value Measurements Narrative (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Debt Instrument, Fair Value Disclosure $ 1,881.1 $ 1,895.8
Debt, Long-term and Short-term, Combined Amount $ 1,812.5 $ 1,851.9