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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, 2021
Nov. 30, 2020
Feb. 29, 2020
Nov. 30, 2019
Feb. 28, 2021
Feb. 29, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance $ 1,937.0 $ 2,127.5 $ 1,987.3 $ 1,918.9 $ 2,127.5 $ 1,918.9
Other comprehensive income (loss), before reclassifications         11.3 (1.8)
Amounts reclassified from accumulated other comprehensive loss         3.3 3.6
Net current period other comprehensive (loss) income 8.4 6.2 (2.0) 3.8 14.6 1.8
Ending balance 1,932.5 1,937.0 2,045.1 1,987.3 1,932.5 2,045.1
Accumulated Other Comprehensive Loss            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance (126.5) (132.7) (147.6) (151.4) (132.7) (151.4)
Net current period other comprehensive (loss) income 8.4 6.2 (2.0) 3.8    
Ending balance (118.1) (126.5) (149.6) (147.6) (118.1) (149.6)
Foreign Currency Items            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance   (53.5)   (65.4) (53.5) (65.4)
Other comprehensive income (loss), before reclassifications         11.3 (1.8)
Amounts reclassified from accumulated other comprehensive loss         0.0 0.0
Net current period other comprehensive (loss) income         11.3 (1.8)
Ending balance (42.2)   (67.2)   (42.2) (67.2)
Defined Benefit Pension Plans            
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]            
Beginning balance   $ (79.2)   $ (86.0) (79.2) (86.0)
Other comprehensive income (loss), before reclassifications         0.0 0.0
Amounts reclassified from accumulated other comprehensive loss         3.3 3.6
Net current period other comprehensive (loss) income         3.3 3.6
Ending balance $ (75.9)   $ (82.4)   $ (75.9) $ (82.4)