Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Non-controlling Interests
Beginning balance at Dec. 31, 2017	$ 805.2	$ 0.3	$ 445.7	$ 364.3	$ (8.1)	$ 3.0
Beginning balance (shares) at Dec. 31, 2017		30,810,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	6.3			5.8		0.5
Other comprehensive (loss) income	12.4				12.4
Share-based compensation expense	3.2		3.2
Common stock issued from share-based compensation plans	1.3		1.3
Common stock issued from share-based compensation plans (shares)		200,000
Common stock repurchases	(2.2)		(2.2)
Common stock repurchases (shares)		(40,000.00)
Other	0.1					0.1
Ending balance at Mar. 31, 2018	828.6	$ 0.3	448.0	372.4	4.3	3.6
Ending balance (shares) at Mar. 31, 2018		30,970,000
Beginning balance at Dec. 31, 2017	805.2	$ 0.3	445.7	364.3	(8.1)	3.0
Beginning balance (shares) at Dec. 31, 2017		30,810,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	42.1
Ending balance at Sep. 30, 2018	841.0	$ 0.3	452.8	406.9	(23.2)	4.2
Ending balance (shares) at Sep. 30, 2018		31,200,000
Beginning balance at Mar. 31, 2018	828.6	$ 0.3	448.0	372.4	4.3	3.6
Beginning balance (shares) at Mar. 31, 2018		30,970,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	13.1			12.3		0.8
Other comprehensive (loss) income	(21.4)				(21.4)
Share-based compensation expense	0.1		0.1
Common stock issued from share-based compensation plans	0.4		0.4
Common stock issued from share-based compensation plans (shares)		30,000.00
Common stock repurchases	(0.1)		(0.1)
Dividend distribution to noncontrolling interest	(0.4)					(0.4)
Other	(0.2)					(0.2)
Ending balance at Jun. 30, 2018	820.1	$ 0.3	448.4	384.7	(17.1)	3.8
Ending balance (shares) at Jun. 30, 2018		31,000,000.00
Increase (Decrease) in Stockholders' Equity
Net income (loss)	22.7			22.2		0.5
Other comprehensive (loss) income	(6.1)				(6.1)
Share-based compensation expense	0.8		0.8
Common stock issued from share-based compensation plans	3.7		3.7
Common stock issued from share-based compensation plans (shares)		210,000
Common stock repurchases	(0.1)		(0.1)
Common stock repurchases (shares)		(10,000.00)
Other	(0.1)					(0.1)
Ending balance at Sep. 30, 2018	841.0	$ 0.3	452.8	406.9	(23.2)	4.2
Ending balance (shares) at Sep. 30, 2018		31,200,000
Beginning balance at Dec. 31, 2018	$ 889.0	$ 0.3	460.2	453.9	(29.9)	4.5
Beginning balance (shares) at Dec. 31, 2018	31,363,650	31,360,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	$ 1.0			0.9		0.1
Other comprehensive (loss) income	(4.5)				(4.6)	0.1
Share-based compensation expense	2.4		2.4
Common stock issued from share-based compensation plans	8.3		8.3
Common stock issued from share-based compensation plans (shares)		410,000
Common stock repurchases	(2.7)		(2.7)
Common stock repurchases (shares)		(40,000.00)
Ending balance at Mar. 31, 2019	893.5	$ 0.3	468.2	454.8	(34.5)	4.7
Ending balance (shares) at Mar. 31, 2019		31,730,000
Beginning balance at Dec. 31, 2018	$ 889.0	$ 0.3	460.2	453.9	(29.9)	4.5
Beginning balance (shares) at Dec. 31, 2018	31,363,650	31,360,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	$ 34.3
Ending balance at Sep. 30, 2019	$ 1,203.1	$ 0.4	759.5	487.9	(49.3)	4.6
Ending balance (shares) at Sep. 30, 2019	35,797,441	35,800,000
Beginning balance at Mar. 31, 2019	$ 893.5	$ 0.3	468.2	454.8	(34.5)	4.7
Beginning balance (shares) at Mar. 31, 2019		31,730,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	14.6			14.4		0.2
Other comprehensive (loss) income	1.6				1.6
Common stock issuance, net	286.3	$ 0.1	286.2
Common stock issuance, net (shares)		4,030,000.00
Share-based compensation expense	1.9		1.9
Common stock issued from share-based compensation plans	0.9		0.9
Common stock issued from share-based compensation plans (shares)		40,000.00
Common stock repurchases	0.0		0.0
Common stock repurchases (shares)		(20,000.00)
Dividend distribution to noncontrolling interest	(0.4)					(0.4)
Other	0.3					0.3
Ending balance at Jun. 30, 2019	1,198.7	$ 0.4	757.2	469.2	(32.9)	4.8
Ending balance (shares) at Jun. 30, 2019		35,780,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)	18.7			18.7
Other comprehensive (loss) income	(16.4)				(16.4)
Share-based compensation expense	2.1		2.1
Common stock issued from share-based compensation plans	0.2		0.2
Common stock issued from share-based compensation plans (shares)		20,000.00
Other	(0.2)					(0.2)
Ending balance at Sep. 30, 2019	$ 1,203.1	$ 0.4	$ 759.5	$ 487.9	$ (49.3)	$ 4.6
Ending balance (shares) at Sep. 30, 2019	35,797,441	35,800,000