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Common Stock and Stock-Based Compensation Stockholders Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Nov. 16, 2018 | Dec. 31, 2017
Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Shares_repurchased_settled_in_subsequent_month |  |  |  |  | $ 4.0 |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 350.0 |  |  |  |  |  | $ 500.0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  | 13,700,000 |  |  |  |  |  |
Accelerated Share Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 350.0 |
Shares repurchased | $ 44.0 | $ 19.0 | $ 50.1 | $ 50.0 |  | $ 100.1 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 287.0 |  |  |  | $ 287.0 |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 10,700,000 |  |  |  | 10,700,000 |  |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |
Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 2,133,116 | 3,500,000 | 1,451,171 | 1,500,000 | 5,607,003 | 2,970,674 |  |
Shares repurchased | $ 44.0 | $ 89.0 | $ 50.1 | $ 50.0 | $ 133.0 |  |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |
Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  | 2,607,172 |  |  |
Shares repurchased |  | $ (70.0) |  |  | $ 70.0 |  |  |

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