Restructuring and Related Costs - Cumulative Restructuring and Related Charges (Details)
$ in Millions |
Apr. 30, 2018
USD ($)
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
$ 83.8
|
| GCA Restructuring Program |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
16.6
|
| 2020 Vision Restructuring Program |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
67.1
|
| External Support Fees |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
32.0
|
| External Support Fees | GCA Restructuring Program |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
2.0
|
| External Support Fees | 2020 Vision Restructuring Program |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
30.0
|
| Employee Severance |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
24.7
|
| Employee Severance | GCA Restructuring Program |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
11.2
|
| Employee Severance | 2020 Vision Restructuring Program |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
13.6
|
| Other Project Fees |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
14.2
|
| Other Project Fees | GCA Restructuring Program |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
3.5
|
| Other Project Fees | 2020 Vision Restructuring Program |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
10.7
|
| Lease Exit |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
7.7
|
| Lease Exit | GCA Restructuring Program |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
0.0
|
| Lease Exit | 2020 Vision Restructuring Program |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
7.7
|
| Asset Impairment |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
5.2
|
| Asset Impairment | GCA Restructuring Program |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
0.0
|
| Asset Impairment | 2020 Vision Restructuring Program |
|
| Restructuring Cost and Reserve [Line Items] |
|
| Cumulative charges |
$ 5.2
|