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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating Income (Loss) |  | $ 362.1 | $ 134.6 | $ (541.8) |
Accounting Standards Update 2017-07 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating Income (Loss) |  |  | $ 54.3 | $ 70.6 |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest | $ (5.4) |  |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  | $ 52.0
Operating Lease, Liability |  |  |  |  | $ 56.0

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