Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Jun. 22, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stockholders Equity Note [Line Items]
Dividends declared and paid per share (usd per share)	$ 0.45	$ 0.45	$ 0.45	$ 0.90	$ 0.90
Dividend equivalents paid				$ 4.1	$ 3.4
Common Stock
Stockholders Equity Note [Line Items]
Common stock repurchased (shares)				252,207
Common stock repurchased, average price per share (usd per share)				$ 19.82
Common Stock
Stockholders Equity Note [Line Items]
Repurchased shares for award (shares)				306,095	312,748
Average repurchase price of shares for award (usd per share)				$ 25.33	$ 34.55
Restricted Stock Units
Stockholders Equity Note [Line Items]
Restricted stock units vested and issued as common stock (shares)				805,521	762,568