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Accumulated Other Comprehensive Income (Loss) Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss, net $ (38.2)   $ (38.2)   $ (34.8)
ASU 2018-02 cumulative transition adjustment         0.7
Other comprehensive (loss) income 0.0 $ 0.3 (2.7) $ 0.6  
Accumulated Translation Adjustment [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss, net (34.2)   (34.2)   (31.5)
ASU 2018-02 cumulative transition adjustment         0.0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     (2.7)    
Accumulated Defined Benefit Plans Adjustment [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss, net (4.0)   (4.0)   (3.3)
ASU 2018-02 cumulative transition adjustment         (0.7)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     0.0    
Accumulated Other Comprehensive Loss, net          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated other comprehensive loss, net $ (38.2)   (38.2)   (34.8)
ASU 2018-02 cumulative transition adjustment         $ (0.7)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax     (2.7)    
Other comprehensive (loss) income     $ (2.7) $ 0.6