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Accumulated Other Comprehensive Income (Loss) Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss, net $ (26.7)   $ (26.7)   $ (24.6)
Other comprehensive loss (1.9) $ (0.1) (2.1) $ (6.8)  
Accumulated Translation Adjustment [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss, net (22.2)   (22.2)   (20.1)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     (2.1)    
Accumulated Defined Benefit Plans Adjustment [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss, net (4.5)   (4.5)   (4.5)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     0.0    
Accumulated Other Comprehensive Loss [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss, net $ (26.7)   (26.7)   $ (24.6)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     (2.1)    
Other comprehensive loss     $ (2.1)