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Stockholders' Equity (Details)									2 Months Ended			9 Months Ended
	Jul. 22, 2016 $ / shares	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	Oct. 30, 2015 dividend $ / shares	Jul. 11, 2016 $ / shares shares	Apr. 19, 2016 $ / shares shares	Jan. 19, 2016 $ / shares shares	Jul. 11, 2016 $ / shares shares	Jun. 30, 2016 USD ($) $ / shares	Dec. 31, 2015 $ / shares	Sep. 30, 2015 USD ($)	Aug. 20, 2014 USD ($) $ / shares
Stockholders' Equity Note [Abstract]
Authorized repurchase amount | $			$ 400,000,000		$ 400,000,000		$ 400,000,000								$ 1,200,000,000
Authorized amount for accelerated stock repurchase program | $			$ (400,000,000)		$ (400,000,000)		$ 400,000,000
Class of Stock [Line Items]
Accelerated shares repurchased (shares) | shares			3,964,812	861,235	4,222,193	970,609	4,140,788			5,083,428	5,111,397
Average price per share paid for stock repurchased for accelerated stock repurchases (in dollars per share)										$ 78.69	$ 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 | $													$ 500,000,000			$ 500,000,000
Commission to sales agent (as a percent)																2.00%
Subsequent event
Class of Stock [Line Items]
Accelerated shares repurchased (shares) | shares		1,104,162							5,068,974.000			15,263,799.000
Average price per share paid for stock repurchased for accelerated stock repurchases (in dollars per share)									$ 78.91			$ 78.62
Dividend declared (in dollars per share)	$ 0.68

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Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

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Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

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-SubTopic 30
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