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Stockholders' Equity (Details) |  |  |  |  |  |  |  | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 11, 2016 shares | May 09, 2016 USD ($) shares | Apr. 19, 2016 shares | Feb. 17, 2016 USD ($) shares | Jan. 19, 2016 shares | Nov. 12, 2015 USD ($) $ / shares shares | Oct. 30, 2015 dividend $ / shares | Jul. 11, 2016 $ / shares shares | Apr. 19, 2016 $ / shares shares | Jan. 19, 2016 $ / shares shares | Dec. 31, 2017 $ / shares | Dec. 31, 2016 $ / shares | Dec. 31, 2015 $ / shares | Sep. 30, 2015 USD ($) | Aug. 20, 2014 USD ($) $ / shares
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount for stock repurchase program |  | $ 400,000,000 |  | $ 400,000,000 |  | $ 400,000,000 |  |  |  |  |  |  |  |  |
Authorized amount for accelerated stock repurchase program |  | $ 400,000,000 |  | $ 400,000,000 |  | $ 400,000,000 |  |  |  |  |  |  |  |  |
Accelerated share repurchased, number of shares purchased (shares) | shares | 1,104,162 | 3,964,812 | 861,235 | 4,222,193 | 970,609 | 4,140,788 |  | 5,068,974.000 | 5,083,428 | 5,111,397 |  |  |  |  |
Average price per share paid for stock repurchased for accelerated stock repurchases (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 78.91 | $ 78.69 | $ 78.26 |  |  |  |  |
Number of dividends declared | dividend |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Dividends declared for common stock (in dollars per share) | $ / shares |  |  |  |  |  | $ 2.00 | $ 2.00 |  |  |  | $ 2.87 | $ 2.75 | $ 6.63 |  |
Par value of common stock (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  | $ 0.01
Maximum price of common stock available to be issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
2015 Stock Buyback Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized amount for stock repurchase program |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000,000 |

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