Reorganization and Restructuring (Details)
$ in Millions |
9 Months Ended |
12 Months Ended |
|
Sep. 30, 2018
USD ($)
position
|
Sep. 30, 2017
USD ($)
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016
USD ($)
|
| Reorganization and Restructuring 2016 |
|
|
|
|
| Restructuring Cost and Reserve [Line Items] |
|
|
|
|
| Cumulative costs |
$ 46.7
|
|
|
|
| Positions eliminated across the global workforce | position |
800
|
|
|
|
| Restructuring Reserve [Roll Forward] |
|
|
|
|
| Restructuring Reserve, beginning balance |
$ 2.0
|
$ 7.6
|
$ 7.6
|
|
| Expense (benefit) |
11.3
|
13.5
|
17.3
|
$ 18.1
|
| Payments and utilization |
(12.4)
|
(17.9)
|
|
|
| Foreign currency exchange effects |
0.0
|
0.2
|
|
|
| Restructuring Reserve, ending balance |
0.9
|
3.4
|
2.0
|
7.6
|
| Asset Related Adjustments | Reorganization and Restructuring 2016 |
|
|
|
|
| Restructuring Reserve [Roll Forward] |
|
|
|
|
| Restructuring Reserve, beginning balance |
0.0
|
0.0
|
0.0
|
|
| Expense (benefit) |
1.7
|
3.4
|
|
|
| Payments and utilization |
(1.7)
|
(3.4)
|
|
|
| Foreign currency exchange effects |
0.0
|
|
|
|
| Restructuring Reserve, ending balance |
0.0
|
0.0
|
0.0
|
0.0
|
| Severance Costs | Reorganization and Restructuring 2016 |
|
|
|
|
| Restructuring Reserve [Roll Forward] |
|
|
|
|
| Restructuring Reserve, beginning balance |
1.6
|
7.0
|
7.0
|
|
| Expense (benefit) |
9.6
|
7.5
|
|
|
| Payments and utilization |
(10.5)
|
(11.9)
|
|
|
| Foreign currency exchange effects |
0.0
|
0.2
|
|
|
| Restructuring Reserve, ending balance |
0.7
|
2.8
|
1.6
|
7.0
|
| Severance Costs | Other Restructuring |
|
|
|
|
| Restructuring Reserve [Roll Forward] |
|
|
|
|
| Expense (benefit) |
4.2
|
|
|
|
| Lease Terminations | Reorganization and Restructuring 2016 |
|
|
|
|
| Restructuring Reserve [Roll Forward] |
|
|
|
|
| Restructuring Reserve, beginning balance |
0.4
|
0.6
|
0.6
|
|
| Expense (benefit) |
0.0
|
0.4
|
|
|
| Payments and utilization |
(0.2)
|
(0.4)
|
|
|
| Foreign currency exchange effects |
0.0
|
|
|
|
| Restructuring Reserve, ending balance |
0.2
|
0.6
|
0.4
|
0.6
|
| Benefit Program Termination | Reorganization and Restructuring 2016 |
|
|
|
|
| Restructuring Reserve [Roll Forward] |
|
|
|
|
| Restructuring Reserve, beginning balance |
0.0
|
0.0
|
0.0
|
|
| Expense (benefit) |
0.0
|
2.2
|
|
|
| Payments and utilization |
0.0
|
(2.2)
|
|
|
| Foreign currency exchange effects |
0.0
|
|
|
|
| Restructuring Reserve, ending balance |
0.0
|
$ 0.0
|
$ 0.0
|
$ 0.0
|
| Minimum | Other Restructuring |
|
|
|
|
| Restructuring Cost and Reserve [Line Items] |
|
|
|
|
| Expected costs |
2.0
|
|
|
|
| Maximum | Other Restructuring |
|
|
|
|
| Restructuring Cost and Reserve [Line Items] |
|
|
|
|
| Expected costs |
$ 4.0
|
|
|
|