Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Mar. 22, 2017	Mar. 31, 2017	Mar. 31, 2016
Stockholders Equity Note [Line Items]
Dividends declared and paid per share (usd per share)	$ 0.45	$ 0.45	$ 0.45
Dividend equivalents paid		$ 2.1	$ 2.0
Common Stock
Stockholders Equity Note [Line Items]
Repurchased shares for award (shares)		423,556	303,035
Average repurchase price of shares for award (usd per share)		$ 29.55	$ 25.37
Restricted Stock Units
Stockholders Equity Note [Line Items]
Restricted stock units vested and issued as common stock (shares)		1,014,271	784,060