Goodwill and Other Intangible Assets - Intangible Assets and Amortization Expense (Details) - USD ($)
$ in Millions |
3 Months Ended |
|
Mar. 31, 2018 |
Mar. 31, 2017 |
Dec. 31, 2017 |
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Gross carrying amount |
$ 56.5
|
|
$ 46.8
|
| Accumulated amortization |
26.9
|
|
25.3
|
| Intangible assets, net |
61.6
|
|
53.5
|
| Amortization expense |
1.6
|
$ 2.7
|
|
| Q2 - Q4 2018 |
4.9
|
|
|
| 2019 |
6.4
|
|
|
| 2020 |
6.3
|
|
|
| 2022 |
6.3
|
|
|
| 2023 |
1.1
|
|
|
| Trademarks |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Unamortized intangible assets, gross carrying amount |
32.0
|
|
32.0
|
| Trademarks |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Gross carrying amount |
0.5
|
|
0.3
|
| Accumulated amortization |
0.2
|
|
0.2
|
| Patents |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Gross carrying amount |
40.8
|
|
40.8
|
| Accumulated amortization |
23.4
|
|
22.2
|
| Customer relationships |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Gross carrying amount |
10.6
|
|
3.3
|
| Accumulated amortization |
1.0
|
|
0.7
|
| Unpatented technologies |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Gross carrying amount |
4.4
|
|
2.4
|
| Accumulated amortization |
2.3
|
|
2.2
|
| Other |
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
| Gross carrying amount |
0.2
|
|
0.0
|
| Accumulated amortization |
$ 0.0
|
|
$ 0.0
|