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Commitments and Contingencies (Details)
CAD in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2017
CAD
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Loss Contingency, Damages Sought, Value | CAD         CAD 10.0    
Document Period End Date       Sep. 30, 2017 Sep. 30, 2017    
Walter Energy tax assessment       $ 33.0      
Amount receivable pending completion of an IRS audit       11.6      
Product Warranty Expense       12.3   $ 5.3 $ 5.1
Operating Leases              
Rent expense   $ 5.8 $ 5.8 5.9      
Future minimum payment under non-cancelable operating leases, CY Plus 1       3.6      
Future minimum payment under non-cancelable operating leases, CY Plus 2       2.5      
Future minimum payment under non-cancelable operating leases, CY Plus 3       2.3      
Future minimum payment under non-cancelable operating leases, CY Plus 4       2.2      
Future minimum payment under non-cancelable operating leases, CY Plus 5       1.9      
Future minimum payment under non-cancelable operating leases, CY plus 6 and up       4.5      
IRS-Walter Energy Claim 1 Total [Member]              
Loss Contingency, Damages Sought, Value $ 554.3            
IRS-Walter Energy Claim 1 Priority [Member]              
Loss Contingency, Damages Sought, Value 229.1            
IRS-Walter Energy Claim 2 [Member]              
Loss Contingency, Damages Sought, Value 860.4            
IRS-Walter Energy Claim 2 Priority [Member]              
Loss Contingency, Damages Sought, Value $ 535.3            
Product Concentration Risk [Member]              
Product Warranty Expense       $ 9.8