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Stockholders' Equity (Details) |  |  |  |  |  |  | 2 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 26, 2016 $ / shares | Apr. 19, 2016 shares | Feb. 22, 2016 shares | Jan. 19, 2016 $ / shares shares | Nov. 13, 2015 USD ($) shares | Oct. 30, 2015 dividend $ / shares | Apr. 19, 2016 $ / shares shares | Jan. 20, 2016 shares | Mar. 31, 2016 USD ($) $ / shares | Feb. 17, 2016 USD ($) | Dec. 31, 2015 $ / shares | Sep. 30, 2015 USD ($) | Aug. 20, 2014 USD ($) | Aug. 17, 2012 $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized repurchase amount | $ |  |  |  |  | $ 400,000,000 |  |  |  |  | $ 400,000,000 |  | $ 1,200,000,000 |  |
Authorized amount for accelerated stock repurchase program | $ |  |  |  |  | $ 400,000,000 |  |  |  |  | $ 400,000,000 |  |  |  |
Accelerated shares repurchased, number of shares purchased (shares) | shares |  |  | 4,222,193 | 970,609 | 4,140,788 |  |  | 5,111,397 |  |  |  |  |  |
Average price per share paid for stock repurchased for accelerated stock repurchases (in dollars per share) |  |  |  | $ 78.26 |  |  |  |  |  |  |  |  |  |
Number of dividends declared | dividend |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Dividend declared (in dollars per share) |  |  |  |  |  | $ 2.00 |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 |  |  | $ 0.01
Maximum price of common stock available to be issued | $ |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  | $ 500,000,000 |
Commission to sales agent (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00%
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated shares repurchased, number of shares purchased (shares) | shares |  | 861,235 |  |  |  |  | 5,083,428 |  |  |  |  |  |  |
Average price per share paid for stock repurchased for accelerated stock repurchases (in dollars per share) |  |  |  |  |  |  | $ 78.69 |  |  |  |  |  |  |
Dividend declared (in dollars per share) | $ 0.68 |  |  |  |  |  |  |  |  |  |  |  |  |

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