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Restructuring and Related Costs - Restructuring and Related Liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Restructuring Reserve [Roll Forward]      
Balance, beginning $ 7.0 $ 8.6 $ 8.4
Costs recognized 7.6 11.2 25.7
Payments (7.9) (12.9) (24.7)
Non-cash items (5.4)   (0.7)
Balance, ending 1.3 7.0 8.6
External Support Fees      
Restructuring Reserve [Roll Forward]      
Balance, beginning 0.5 0.0 2.5
Costs recognized 1.4 1.5 4.0
Payments (1.9) (1.0) (6.5)
Non-cash items 0.0   0.0
Balance, ending 0.0 0.5 0.0
Employee Severance      
Restructuring Reserve [Roll Forward]      
Balance, beginning 3.0 3.8 2.7
Costs recognized 0.3 4.6 11.0
Payments (2.0) (5.3) (9.9)
Non-cash items 0.0   0.0
Balance, ending 1.3 3.0 3.8
Other Project Fees      
Restructuring Reserve [Roll Forward]      
Balance, beginning 0.7 1.8 0.4
Costs recognized 3.2 4.5 8.2
Payments (3.7) (5.6) (6.7)
Non-cash items (0.2)   0.0
Balance, ending 0.0 0.7 1.8
Lease Exit Costs      
Restructuring Reserve [Roll Forward]      
Balance, beginning 2.7 3.1 2.8
Costs recognized 2.7 0.7 2.0
Payments (0.2) (1.1) (1.5)
Non-cash items (5.3)   (0.2)
Balance, ending 0.0 2.7 3.1
Asset Impairment      
Restructuring Reserve [Roll Forward]      
Balance, beginning 0.0 0.0 0.0
Costs recognized 0.0 0.0 0.6
Payments 0.0 0.0 0.0
Non-cash items 0.0   (0.6)
Balance, ending $ 0.0 $ 0.0 $ 0.0