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Fair Value Measurements (Details 2) - Level 2 - USD ($)
$ in Millions
Jun. 30, 2015
Jun. 30, 2014
Carrying Value    
Carrying amounts and estimated fair values of financial instruments not recorded at fair value    
Long-term debt $ 607.1 $ 604.3
Company-owned life insurance 13.0 16.2
Fair Value    
Carrying amounts and estimated fair values of financial instruments not recorded at fair value    
Long-term debt 628.6 638.7
Company-owned life insurance $ 13.0 $ 16.2