Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($)
$ in Millions |
12 Months Ended |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Gross Carrying Amount |
$ 166.9
|
$ 69.4
|
|
| Accumulated Amortization |
(61.2)
|
(50.3)
|
|
| Net Carrying Amount |
105.7
|
19.1
|
|
| Amortization of intangible assets |
8.4
|
3.6
|
$ 4.2
|
| Finite-Lived Intangible Assets, Future Amortization Expense [Abstract] |
|
|
|
| 2018 |
14.7
|
|
|
| 2019 |
13.3
|
|
|
| 2020 |
11.5
|
|
|
| 2021 |
11.1
|
|
|
| 2022 |
9.7
|
|
|
| Indefinite-lived trade names |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Gross Carrying Amount |
7.9
|
7.5
|
|
| Accumulated Amortization |
0.0
|
0.0
|
|
| Net Carrying Amount |
7.9
|
7.5
|
|
| Customer relationships |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Gross Carrying Amount |
137.5
|
50.2
|
|
| Accumulated Amortization |
(51.9)
|
(43.5)
|
|
| Net Carrying Amount |
$ 85.6
|
6.7
|
|
| Weighted-average amortization period |
8 years 10 months 24 days
|
|
|
| Finite-lived trade names |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Gross Carrying Amount |
$ 8.4
|
1.3
|
|
| Accumulated Amortization |
(2.3)
|
(1.2)
|
|
| Net Carrying Amount |
$ 6.1
|
0.1
|
|
| Weighted-average amortization period |
3 years 9 months 18 days
|
|
|
| Amortization of intangible assets |
$ 8.4
|
|
|
| Other contract-related assets |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Gross Carrying Amount |
6.6
|
6.7
|
|
| Accumulated Amortization |
(3.0)
|
(2.4)
|
|
| Net Carrying Amount |
$ 3.6
|
4.3
|
|
| Weighted-average amortization period |
6 years 7 months 6 days
|
|
|
| Other |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Gross Carrying Amount |
$ 6.5
|
3.7
|
|
| Accumulated Amortization |
(4.0)
|
(3.2)
|
|
| Net Carrying Amount |
$ 2.5
|
0.5
|
|
| Weighted-average amortization period |
2 years 1 month 6 days
|
|
|
| India | Customer relationships |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Impairment charge |
|
$ 6.5
|
|