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Fair Value Measurements Fair Value Measurements - Narrative (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Jun. 30, 2013
Fair Value Disclosures [Abstract]    
Long-term Debt, Carrying Value $ 3,556.2 $ 3,493.8
Long-term Debt, Fair Value $ 3,805.4 $ 3,621.0