Subsequent Event (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended
	Nov. 15, 2018	Feb. 01, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Completed common stock repurchase (in shares)			1,600,000
Shares repurchased, value	$ 16.5
Remaining authorized repurchase amount			$ 33.5
Subsequent Event
Subsequent Event [Line Items]
Completed common stock repurchase (in shares)		561,851
Shares repurchased, value		$ 6.4
Average price per share (in dollars per share)		$ 11.44
Remaining authorized repurchase amount		$ 27.1