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Segment Information (Revenue and Long-Lived Assets by Geographical Areas) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue, Net $ 302.5 $ 310.1 $ 283.6 $ 242.7 $ 311.4 $ 301.0 $ 290.3 $ 261.8 $ 1,138.9 $ 1,164.5 $ 1,184.7
Intangible Assets, Net (Including Goodwill) 486.0       507.3       486.0 507.3  
Total assets 1,280.6       1,229.8       $ 1,280.6 1,229.8  
Document Period End Date                 Sep. 30, 2016    
Property, plant and equipment, net 155.1       148.9       $ 155.1 148.9  
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue, Net                 1,020.7 1,037.7 1,040.6
Property, plant and equipment, net 149.3       142.9       149.3 142.9  
Canada                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue, Net                 73.8 82.7 101.1
Property, plant and equipment, net 2.5       2.7       2.5 2.7  
Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Revenue, Net                 44.4 44.1 $ 43.0
Property, plant and equipment, net $ 3.3       $ 3.3       $ 3.3 $ 3.3