Share Repurchase Program (Details) - USD ($)	1 Months Ended	3 Months Ended
	Oct. 31, 2014	Sep. 30, 2015
Equity [Abstract]
Authorized amount	$ 500,000,000
Stock repurchase program term	2 years
Shares purchased (in shares)		1,206,600
Purchase of treasury stock		$ 45,900,000
Remaining authorized amount for future purchases		$ 329,600,000