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New Accounting Pronouncements - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Decrease in retained deficit | $ (742,300,000) | $ (831,600,000) |  |
Classification of excess income tax benefits on share-based compensation awards within operating activities | 47,600,000 | $ 6,500,000 | $ (38,500,000) |
Accounting Standards Update 2016-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Classification of excess income tax benefits on share-based compensation awards within operating activities | 600,000 |  |  |
Benefit for excess tax benefits related to stock compensation awards | $ (0.6) |  |  |
Scenario, Forecast [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Decrease in retained deficit |  |  |  | $ 6,000,000

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