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Debt Including Capital Lease Obligations - Narrative (Details)
$ in Millions
Jun. 30, 2017
USD ($)
Line of Credit  
Line of Credit Facility  
Letters of credit outstanding, amount $ 1.8
Letter of credit remaining amount $ 297.0
Senior Notes | Minimum  
Line of Credit Facility  
Leverage ratio 3.00
Senior Notes | Maximum  
Line of Credit Facility  
Leverage ratio 3.75