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Segment Information (Revenue and Long-Lived Assets by Geographical Areas) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales $ 320.7 $ 318.5 $ 288.1 $ 257.4 $ 293.2 $ 299.4 $ 283.1 $ 245.1 $ 1,184.7 $ 1,120.8 $ 1,023.9
Property, plant and equipment, net 146.3       141.9       146.3 141.9  
United States
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 1,040.7 971.0 872.3
Property, plant and equipment, net 138.5       133.6       138.5 133.6  
Canada
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 101.0 101.5 112.4
Property, plant and equipment, net 4.3       4.7       4.3 4.7  
Other
                     
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 43.0 48.3 39.2
Property, plant and equipment, net $ 3.5       $ 3.6       $ 3.5 $ 3.6