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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2014
Fair Value Disclosures [Abstract]    
Senior Notes $ 146.6us-gaap_SeniorNotes $ 153.3us-gaap_SeniorNotes
Fair value of long-term debt $ 154.3us-gaap_LongTermDebtFairValue $ 160.1us-gaap_LongTermDebtFairValue