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Stockholders' Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2019 | Jan. 21, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  | $ (40.0) |  | $ (40.0) | $ (37.5) |  |
Number of shares authorized to be repurchased under the plan |  |  |  |  |  |  | 20,000,000.0
UpfrontPaymentUnderAcceleratedStockRepurchaseProgram |  | $ 50.0 |  | $ 50.0 |  |  |
Stock Repurchased and Retired During Period, Shares | (700,000) | (3,100,000) | (800,000) | (3,200,000) |  |  |
UnsettledForwardContractIndexedtoIssuersStockClassifiedwithinStock |  | $ 10.0 |  | $ 10.0 |  |  |
Remaining shares authorized to be repurchased |  |  |  |  |  | 3,600,000 |

X
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