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Summary of Significant Accounting Policies - Self Insurance (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
May 31, 2011
Accounting Policies [Abstract]      
Workers' Compensation Liability $ 9.8 $ 9.6  
Loss Contingency, Estimated Recovery from Third Party, Amount 1.2 1.2  
Letters of credit outstanding, amount 6.5   5.9
Medical insurance, reserve 0.9 0.8  
Liability for Unpaid Claims and Claims Adjustment Expense, Gross $ 0.9 $ 0.4