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Segment Information - By Reportable Segment (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable segments | segment |  |  | 2 |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 363.1 | $ 313.0 | $ 718.3 | $ 615.5 | $ 1,265.4
Operating income from continuing operations | 25.3 | 21.7 | 45.4 | 34.1 | $ 71.3
Reportable Segments | IPG |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 231.2 | 202.7 | 443.4 | 392.9 |
Operating income from continuing operations | 23.0 | 22.9 | 39.3 | 35.4 |
Reportable Segments | ETG |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 131.9 | 110.3 | 274.9 | 222.6 |
Operating income from continuing operations | 7.2 | 5.7 | 16.5 | 11.5 |
Reportable Segments | NATG |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income from continuing operations | 0.0 | (0.4) | 0.0 | (0.4) |
Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income from continuing operations | $ (4.9) | $ (6.5) | $ (10.4) | $ (12.4) |

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