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Derivative Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Derivative Instruments Activities Disclosures          
Derivative, notional amount $ 350.0   $ 350.0   $ 350.0
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, before tax (8.3)   (8.3)   (9.4)
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, net of tax (7.7)   (7.7)   (8.8)
Unrealized net gain (loss) on derivatives to be reclassified during next 12 months, net (2.3)   (2.3)    
Derivative asset, fair value, gross liability 7.9   7.9   10.4
Cash (paid) received on derivative settlements, net (1.2) $ 0.2 (2.4) $ 0.2  
Gain (loss), net on derivatives (0.5) 0.2 (1.0) 0.2  
Fair Value Adjustment          
Derivative Instruments Activities Disclosures          
Gain (loss), net on derivatives 0.1 0.2 0.1 0.2  
Reclassified from AOCI          
Derivative Instruments Activities Disclosures          
Gain (loss), net on derivatives (0.6) $ 0.0 (1.1) $ 0.0  
Other current liabilities          
Derivative Instruments Activities Disclosures          
Derivative asset, fair value, gross liability 4.7   4.7   4.6
Other noncurrent liabilities          
Derivative Instruments Activities Disclosures          
Derivative asset, fair value, gross liability 3.2   3.2   5.8
Other liabilities          
Derivative Instruments Activities Disclosures          
Derivative asset, fair value, gross liability $ 7.9   $ 7.9   $ 10.4