Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Mar. 21, 2018	Mar. 31, 2018	Mar. 31, 2017	Oct. 31, 2017
Stockholders Equity Note [Line Items]
Dividends declared and paid per share (usd per share)	$ 0.05	$ 0.05	$ 0.45
Dividend equivalents paid		$ 0.3	$ 2.1
Repurchased shares for award, value		$ 6.7
Common Stock
Stockholders Equity Note [Line Items]
Repurchased shares for award (shares)		361,453	423,556
Average repurchase price of shares for award (usd per share)		$ 18.40	$ 29.55
Restricted Stock Units
Stockholders Equity Note [Line Items]
Restricted stock units vested and issued as common stock (shares)		918,073	1,014,271
Common Stock
Stockholders Equity Note [Line Items]
Treasury stock, shares, acquired (shares)		341,742
Common Stock | Stock Repurchase Program Authorized in September 2017 [Member]
Stockholders Equity Note [Line Items]
Stock repurchase program, authorized amount				$ 285.0
Treasury stock, shares, acquired (shares)		1,396,710
Treasury stock acquired, average cost per share		$ 20.12
Treasury stock, value, acquired, cost method		$ 28.1
Common Stock | Stock Repurchase Program Authorized in September 2017, Modified Dutch Auction [Member]
Stockholders Equity Note [Line Items]
Treasury stock, shares, acquired (shares)		1,054,968