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Commitments and Contingencies (Details)
CAD in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2015
CAD
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Loss Contingency, Damages Sought, Value | CAD       CAD 10.0    
Amount payable pending completion of an IRS audit $ 11.6   $ 11.6      
Operating Leases            
Proceeds from Sale of Productive Assets     4.9   $ 1.2  
Provision for Doubtful Accounts $ 11.6 $ 0.0 $ 11.6   $ 0.0  
Prior To 1995 [member]            
Walter Energy tax assessment           $ 33.0