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Common Stock and Stock-Based Compensation Stockholders Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Nov. 16, 2018 | Dec. 31, 2017
Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
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 | $ 100.9 | $ 44.0 | $ 19.0 | $ 50.0 | $ 50.1 | $ 50.0 |  | $ 150.1 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 186.1 |  |  |  |  |  | $ 186.1 |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 5,500,000 |  |  |  |  |  | 5,500,000 |  |  |
Share-based Payment Arrangement, Cash Used to Settle Award |  |  |  |  |  |  | $ 9.0 |  |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |
Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired |  |  |  |  |  |  | 2,607,172 |  |  |
Shares repurchased | $ 8.6 |  | $ (70.0) |  |  |  | $ 70.0 |  |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |  |  |
Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 5,171,489 | 2,100,000 | 3,500,000 | 1,356,484 | 1,500,000 | 1,500,000 | 10,778,492 | 4,327,158 |  |
Shares repurchased | $ 100.9 | $ 44.0 | $ 89.0 | $ 50.0 | $ 50.1 | $ 50.0 | $ 233.9 |  |  |

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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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