Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Non-controlling Interests
Beginning balance at Dec. 31, 2015	$ 675.7	$ 0.3	$ 387.1	$ 308.1	$ (24.9)	$ 5.1
Beginning balance (shares) at Dec. 31, 2015		30,550,000
Increase (Decrease) in Stockholders' Equity
Net Income (loss)	24.7			28.2		(3.5)
Other comprehensive (loss) income	(10.3)				(10.3)
Share-based compensation expense	10.7		10.7
Common stock issued from share-based compensation plans	0.4		0.4
Common stock issued from share-based compensation plans (shares)		100,000
Excess tax deficiency from exercise of stock options	(1.7)		(1.7)
Common stock repurchases	(0.7)		(0.7)
Common stock repurchases (shares)		(40,000)
Other	(0.2)					(0.2)
Ending balance at Dec. 31, 2016	698.6	$ 0.3	395.8	336.3	(35.2)	1.4
Ending balance (shares) at Dec. 31, 2016		30,610,000
Increase (Decrease) in Stockholders' Equity
Net Income (loss)	29.5	$ 0.0	0.0	28.0		1.5
Other comprehensive (loss) income	27.2				27.1	0.1
Equity component of convertible notes issuance, net of deferred financing fees and deferred taxes	36.6		36.6
Proceeds from issuance of warrants	46.0		46.0
Purchase of call options, net of deferred taxes	(38.1)		(38.1)
Repurchase of convertible notes	(5.8)		(5.8)
Share-based compensation expense	11.1		11.1
Common stock issued from share-based compensation plans	2.0		2.0
Common stock issued from share-based compensation plans (shares)		250,000
Common stock repurchases	(2.0)		(2.0)
Common stock repurchases (shares)		(50,000)
Other	0.1		0.1
Ending balance at Dec. 31, 2017	$ 805.2	$ 0.3	445.7	364.3	(8.1)	3.0
Ending balance (shares) at Dec. 31, 2017	30,804,832	30,810,000
Increase (Decrease) in Stockholders' Equity
Net Income (loss)	$ 90.0			88.0		2.0
Other comprehensive (loss) income	(21.8)				(21.8)	0.0
Share-based compensation expense	6.9		6.9
Common stock issued from share-based compensation plans	10.3		10.3
Common stock issued from share-based compensation plans (shares)		600,000
Common stock repurchases	(2.7)		(2.7)
Common stock repurchases (shares)		(50,000)
Dividend distribution to noncontrolling interest	(0.4)					(0.4)
Other	(0.1)		0.0			(0.1)
Ending balance at Dec. 31, 2018	$ 889.0	$ 0.3	$ 460.2	$ 453.9	$ (29.9)	$ 4.5
Ending balance (shares) at Dec. 31, 2018	31,363,650	31,360,000