Stock Repurchase Plans (Details) - USD ($) $ / shares in Units, shares in Thousands		4 Months Ended	6 Months Ended		11 Months Ended	33 Months Ended
	Nov. 20, 2013	Jul. 21, 2017	Jun. 30, 2017	Jun. 30, 2016	Apr. 30, 2017	Aug. 31, 2016	Mar. 30, 2017	Jun. 07, 2016
Equity, Class of Treasury Stock [Line Items]
Value of shares repurchased			$ 379,386,000	$ 44,091,000
November 2013 Stock Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Amount of shares authorized to be repurchased under Stock Repurchase Program	$ 500,000,000.0
Stock Repurchase Program, Period in Force	4 years
Total number of shares purchased						11,428
Value of shares repurchased						$ 500,000,000
Shares Acquired, Average Cost Per Share						$ 43.75
June 2016 Stock Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Amount of shares authorized to be repurchased under Stock Repurchase Program								$ 500,000,000.0
Total number of shares purchased					8,392
Value of shares repurchased					$ 500,000,000
Shares Acquired, Average Cost Per Share					$ 59.58
March 2017 Stock Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Amount of shares authorized to be repurchased under Stock Repurchase Program							$ 500,000,000
March 2017 Stock Repurchase Plan [Member] | Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Total number of shares purchased		606
Value of shares repurchased		$ 37,200,000
Shares Acquired, Average Cost Per Share		$ 61.36
Permitted dollar value of repurchases remaining		$ 462,800,000