Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions |
6 Months Ended |
12 Months Ended |
Jun. 30, 2017 |
Dec. 31, 2016 |
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Weighted Average Remaining Useful Life (in Years) |
12 years 6 months
|
12 years 10 months 30 days
|
| Gross Carrying Amount |
$ 462.4
|
$ 456.4
|
| Accumulated Amortization |
$ 106.2
|
$ 89.3
|
| Customer Relationships |
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Weighted Average Remaining Useful Life (in Years) |
12 years 8 months 12 days
|
13 years 1 month
|
| Gross Carrying Amount |
$ 429.4
|
$ 424.5
|
| Accumulated Amortization |
$ 93.9
|
$ 79.8
|
| Trademarks and Trade Names |
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Weighted Average Remaining Useful Life (in Years) |
10 years 6 months
|
10 years 5 months 30 days
|
| Gross Carrying Amount |
$ 28.8
|
$ 27.7
|
| Accumulated Amortization |
$ 10.6
|
$ 8.1
|
| Other Intangible Assets |
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Weighted Average Remaining Useful Life (in Years) |
4 years 1 month 6 days
|
4 years 3 months
|
| Gross Carrying Amount |
$ 4.2
|
$ 4.2
|
| Accumulated Amortization |
$ 1.7
|
$ 1.4
|