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Financial Instrument, Risk Management and Fair Value Measurements Narrative (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Debt Instrument, Fair Value Disclosure $ 1,372.5 $ 1,057.0
Debt, Long-term and Short-term, Combined Amount $ 1,277.1 $ 965.1