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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Jul. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning Balance $ 1,137.1 $ 992.9 $ 992.9
Other comprehensive (loss) income before reclassifications and tax (9.3) (0.7)  
Tax expense (0.2) (1.0)  
Other comprehensive (loss) income before reclassifications, net of tax (9.5) (1.7)  
Reclassifications, before tax 3.1 3.6  
Tax expense (0.8) (0.7)  
Reclassifications, net of tax 2.3 2.9  
Net other comprehensive (loss) income (7.2) 1.2  
Ending Balance 1,115.9 1,052.6 1,137.1
Curtailment charge     0.8
Accumulated other comprehensive loss (125.4)   (118.2)
Scenario, Adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Accumulated other comprehensive loss     4.0
Total      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning Balance (118.2) (184.0) (184.0)
Net other comprehensive (loss) income (7.2) 1.2  
Ending Balance (125.4) (182.8) (118.2)
Foreign Currency Translation Adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning Balance (44.0) (74.0) (74.0)
Other comprehensive (loss) income before reclassifications and tax (10.5) (5.0)  
Tax expense 0.0 0.0  
Other comprehensive (loss) income before reclassifications, net of tax (10.5) (5.0)  
Reclassifications, before tax 0.0 0.0  
Tax expense 0.0 0.0  
Reclassifications, net of tax 0.0 0.0  
Net other comprehensive (loss) income (10.5) (5.0)  
Ending Balance (54.5) (79.0) (44.0)
Pension Benefits      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning Balance (74.7) (110.0) (110.0)
Other comprehensive (loss) income before reclassifications and tax 0.0 4.0  
Tax expense 0.0 (1.0)  
Other comprehensive (loss) income before reclassifications, net of tax 0.0 3.0  
Reclassifications, before tax 2.5 3.6  
Tax expense (0.5) (0.5)  
Reclassifications, net of tax 2.0 3.1  
Net other comprehensive (loss) income 2.0 6.1  
Ending Balance (72.7) (103.9) (74.7)
Derivative Financial Instruments      
Accumulated Other Comprehensive Income (Loss), Net of Tax      
Beginning Balance 0.5 0.0 0.0
Other comprehensive (loss) income before reclassifications and tax 1.2 0.3  
Tax expense (0.2) 0.0  
Other comprehensive (loss) income before reclassifications, net of tax 1.0 0.3  
Reclassifications, before tax 0.6 0.0  
Tax expense (0.3) (0.2)  
Reclassifications, net of tax 0.3 (0.2)  
Net other comprehensive (loss) income 1.3 0.1  
Ending Balance $ 1.8 $ 0.1 $ 0.5