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Accounting Policies - Recently Adopted Accounting Standards (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
New Accounting Pronouncements |  |  |
Non-current deferred tax asset |  | $ 1.6 | $ 1.6
Noncurrent deferred tax liability |  | 38.5 | 55.2
Long-term Debt |  | 355.0 | 499.5
Unamortized debt issuance costs |  | $ 1.6 | $ 2.4
Accounting Standards Update 2016-02 | Forecast | Minimum |  |  |
New Accounting Pronouncements |  |  |
Right-of-use asset | $ 25.0 |  |
Operating lease liability | 25.0 |  |
Accounting Standards Update 2016-02 | Forecast | Maximum |  |  |
New Accounting Pronouncements |  |  |
Right-of-use asset | 40.0 |  |
Operating lease liability | $ 40.0 |  |

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