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Commitments and Contingencies (Details)
In Millions, unless otherwise specified
 9 Months Ended 6 Months Ended
Jun. 30, 2014
USD ($)
Jun. 30, 2014
CAD
Jun. 30, 2013
USD ($)
Sep. 30, 2013
CAD
Jun. 30, 2014
Prior To 1995 [member]
USD ($)
Jun. 30, 2014
From 2000 to 2005 [Member]
USD ($)
Dec. 31, 2014
Subsequent Event [Member]
USD ($)
Loss Contingency, Damages Sought, Value   10.0          
Damages arising due to alleged environmental contamination of the property and breach of lease       10      
Walter Energy tax assessment         34.0 82.2  
Walter Energy tax assessment prior to 1995 related to timing 21.0            
Amount payable pending completion of an IRS audit 11.6            
Multiemployer Plans, Withdrawal Obligation 1.0            
Assets Held-for-sale, Property, Plant and Equipment 0.8            
Proceeds from Sale of Productive Assets $ 1.2   $ 0.1       $ 3.5