Stockholders' Equity of the Company (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	8 Months Ended
	Mar. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Aug. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased During Period, Shares	982	982
Stock Repurchase Program, Authorized Amount				$ 1,000.0
Treasury Stock Acquired, Average Cost Per Share	$ 103.89
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 999.9	$ 999.9
Authorized capital stock (shares)	260,000,000	260,000,000
Authorized shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	160,000,000	160,000,000	160,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Excess stock, shares authorized (shares)	75,000,000	75,000,000
Excess stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	25,000,000	25,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Excess shares issued (shares)	0	0