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Accumulated Other Comprehensive (Loss)/Income (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ (238.8) $ (266.1) $ (249.3)
OCI before reclassifications (2.5) 20.0 (20.7)
Reclassifications to earnings 19.9 7.3 3.9
Reclassifications to retained earnings (20.4)    
Ending balance (241.8) (238.8) (266.1)
Foreign Currency Translation Adjustments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (93.1) (99.4) (109.6)
OCI before reclassifications (20.5) 6.3 10.2
Reclassifications to earnings 0.0 0.0 0.0
Reclassifications to retained earnings 0.0    
Ending balance (113.6) (93.1) (99.4)
Pension Activity      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (139.4) (159.9) (139.8)
OCI before reclassifications 6.7 14.3 (25.3)
Reclassifications to earnings 16.2 6.2 5.2
Reclassifications to retained earnings (19.9)    
Ending balance (136.4) (139.4) (159.9)
Hedging Activity | Hedging Activity      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (4.5) (0.7) 3.4
OCI before reclassifications 4.8 (3.4) (1.0)
Reclassifications to earnings 3.0 (0.4) (3.1)
Reclassifications to retained earnings 0.0    
Ending balance 3.3 (4.5) (0.7)
Interest Rate Swap | Hedging Activity      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1.8) (6.1) (3.3)
OCI before reclassifications 6.5 2.8 (4.6)
Reclassifications to earnings 0.7 1.5 1.8
Reclassifications to retained earnings (0.5)    
Ending balance $ 4.9 $ (1.8) $ (6.1)