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Management Actions (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Approximate time anticipated savings will offset the restructuring charge | 1 year |  |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Charges, net of noncash expenses |  |  | $ 3.4
Restructuring Reserve beginning balance | $ 2.2 |  |
Cash Payments | (0.1) | $ (2.1) |
Foreign currency adjustments |  | (0.1) |
Restructuring Reserve ending balance | 6.4 | 2.2 |
Selling and Administrative Expense |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Charges | 4.3 | 1.0 |
Restructuring Reserve [Roll Forward] |  |  |
Restructuring Charges | $ 4.3 | $ 1.0 |

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