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Stock Repurchase Plan - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Feb. 09, 2017 | Oct. 31, 2015
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Total cost of shares repurchased |  | $ 122,000,000 | $ 84,900,000 |  |
2015 Repurchase Plan |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Authorized amount to repurchase outstanding common stock |  |  |  |  | $ 250,000,000
2017 Repurchase Plan |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Authorized amount to repurchase outstanding common stock |  |  |  | $ 300,000,000 |
Remaining amount of authorized under 2017 Repurchase Plan | $ 270,700,000 | 270,700,000 |  |  |
2015 & 2017 Repurchase Plan |  |  |  |  |
Equity Class Of Treasury Stock [Line Items] |  |  |  |  |
Total cost of shares repurchased | $ 1,200,000 | $ 122,000,000 |  |  |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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