Post Retirement Benefit Plans - Fair Value Measurements for Pension Assets (Detail) - USD ($)
$ in Millions
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2014
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets $ 626.3 $ 624.7 $ 650.8
Mutual funds      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 257.2 285.6  
Common stock      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 39.7 26.7  
Cash      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 18.6 20.0  
Common collective trusts      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 136.7 128.3  
Corporate bonds      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 29.7 19.7  
Government bonds      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 16.5 10.0  
Insurance annuity      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 125.4 130.2  
Other assets      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 2.5 3.6  
Money market fund      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets   0.6  
Level 1      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 163.2 171.7  
Level 1 | Mutual funds      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 104.9 124.4  
Level 1 | Common stock      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 39.7 26.7  
Level 1 | Cash      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 18.6 20.0  
Level 1 | Common collective trusts      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 1 | Corporate bonds      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 1 | Government bonds      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 1 | Insurance annuity      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 1 | Other assets      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 1 | Money market fund      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets   0.6  
Level 2      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 337.7 322.8  
Level 2 | Mutual funds      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 152.3 161.2  
Level 2 | Common stock      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 2 | Cash      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 2 | Common collective trusts      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 136.7 128.3  
Level 2 | Corporate bonds      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 29.7 19.7  
Level 2 | Government bonds      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 16.5 10.0  
Level 2 | Insurance annuity      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 2 | Other assets      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 2.5 3.6  
Level 2 | Money market fund      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets   0.0  
Level 3      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 125.4 130.2 $ 151.1
Level 3 | Mutual funds      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 3 | Common stock      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 3 | Cash      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 3 | Common collective trusts      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 3 | Corporate bonds      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 3 | Government bonds      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 0.0 0.0  
Level 3 | Insurance annuity      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets 125.4 130.2  
Level 3 | Other assets      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets $ 0.0 0.0  
Level 3 | Money market fund      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Fair value of plan assets   $ 0.0