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Comprehensive Income - Changes in Components of Accumulated Other Comprehensive Income (Loss) Items (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2022
Nov. 30, 2021
Feb. 28, 2021
Nov. 30, 2020
Feb. 28, 2022
Feb. 28, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance $ 2,072.9 $ 2,044.5 $ 1,937.0 $ 2,127.5 $ 2,044.5 $ 2,127.5
Other comprehensive (loss) income before reclassifications         (7.1) 11.3
Amounts reclassified from accumulated other comprehensive loss         2.4 3.3
Net current period other comprehensive income 6.0 (10.7) 8.4 6.2 (4.7) 14.6
Ending balance 2,104.3 2,072.9 1,932.5 1,937.0 2,104.3 1,932.5
Accumulated Other Comprehensive Loss            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance (108.9) (98.2) (126.5) (132.7) (98.2) (132.7)
Net current period other comprehensive income 6.0 (10.7) 8.4 6.2    
Ending balance (102.9) (108.9) (118.1) (126.5) (102.9) (118.1)
Foreign Currency Items            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance   (40.2)   (53.5) (40.2) (53.5)
Other comprehensive (loss) income before reclassifications         (7.1) 11.3
Amounts reclassified from accumulated other comprehensive loss         0.0 0.0
Net current period other comprehensive income         (7.1) 11.3
Ending balance (47.3)   (42.2)   (47.3) (42.2)
Defined Benefit Pension Plans            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance   $ (58.0)   $ (79.2) (58.0) (79.2)
Other comprehensive (loss) income before reclassifications         0.0 0.0
Amounts reclassified from accumulated other comprehensive loss         2.4 3.3
Net current period other comprehensive income         2.4 3.3
Ending balance $ (55.6)   $ (75.9)   $ (55.6) $ (75.9)