Condensed Consolidated Statements of Shareholder's Equity Statement - USD ($) $ in Millions	Total	Common Stock	Capital In Excess of Par Value	Treasury Stock, Common [Member]	Retained Earnings (Deficit)	Accumulated Other Comprehensive Loss
Beginning balance, common stock outstanding (in shares) at Dec. 31, 2017		69,644,918		0
Beginning balance, equity at Dec. 31, 2017	$ 520.7	$ 0.7	$ 675.9	$ 0.0	$ (70.5)	$ (85.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation activity (in shares)		732,789
Stock-based compensation activity	5.5	$ 0.0	5.5
Net earnings (loss)	5.9				5.9
Other comprehensive income, net of tax	31.0					31.0
Ending balance, common stock outstanding (in shares) at Mar. 31, 2018		70,377,707		0
Ending balance, equity at Mar. 31, 2018	563.1	$ 0.7	681.4	$ 0.0	(64.6)	(54.4)
Beginning balance, common stock outstanding (in shares) at Dec. 31, 2017		69,644,918		0
Beginning balance, equity at Dec. 31, 2017	520.7	$ 0.7	675.9	$ 0.0	(70.5)	(85.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income, net of tax	(34.6)					(34.6)
Ending balance, common stock outstanding (in shares) at Sep. 30, 2018		70,716,952		0
Ending balance, equity at Sep. 30, 2018	536.6	$ 0.7	690.7	$ 0.0	(34.8)	(120.0)
Beginning balance, common stock outstanding (in shares) at Mar. 31, 2018		70,377,707		0
Beginning balance, equity at Mar. 31, 2018	563.1	$ 0.7	681.4	$ 0.0	(64.6)	(54.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation activity (in shares)		117,413
Stock-based compensation activity	4.3	$ 0.0	4.3
Net earnings (loss)	14.9				14.9
Other comprehensive income, net of tax	(49.8)					(49.8)
Ending balance, common stock outstanding (in shares) at Jun. 30, 2018		70,495,120		0
Ending balance, equity at Jun. 30, 2018	532.5	$ 0.7	685.7	$ 0.0	(49.7)	(104.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation activity (in shares)		221,832
Stock-based compensation activity	5.0	$ 0.0	5.0
Net earnings (loss)	14.9				14.9
Other comprehensive income, net of tax	(15.8)					(15.8)
Ending balance, common stock outstanding (in shares) at Sep. 30, 2018		70,716,952		0
Ending balance, equity at Sep. 30, 2018	$ 536.6	$ 0.7	690.7	$ 0.0	(34.8)	(120.0)
Beginning balance, common stock outstanding (in shares) at Dec. 31, 2018	70,454,138	70,726,800		(272,662)
Beginning balance, equity at Dec. 31, 2018	$ 526.8	$ 0.7	693.5	$ (3.5)	(29.0)	(134.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation activity (in shares)		317,861
Stock-based compensation activity	4.6	$ 0.0	4.6
Treasury Stock, Shares, Acquired				(270,212)
Treasury Stock, Value, Acquired, Cost Method	(3.7)			$ (3.7)
Net earnings (loss)	(0.8)				(0.8)
Other comprehensive income, net of tax	9.6					9.6
Ending balance, common stock outstanding (in shares) at Mar. 31, 2019		71,044,661		(542,874)
Ending balance, equity at Mar. 31, 2019	$ 537.0	$ 0.7	698.1	$ (7.2)	(29.3)	(125.3)
Beginning balance, common stock outstanding (in shares) at Dec. 31, 2018	70,454,138	70,726,800		(272,662)
Beginning balance, equity at Dec. 31, 2018	$ 526.8	$ 0.7	693.5	$ (3.5)	(29.0)	(134.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income, net of tax	$ (37.4)					(37.4)
Ending balance, common stock outstanding (in shares) at Sep. 30, 2019	70,746,408	71,289,282		(542,874)
Ending balance, equity at Sep. 30, 2019	$ 529.2	$ 0.7	707.1	$ (7.2)	0.9	(172.3)
Beginning balance, common stock outstanding (in shares) at Mar. 31, 2019		71,044,661		(542,874)
Beginning balance, equity at Mar. 31, 2019	537.0	$ 0.7	698.1	$ (7.2)	(29.3)	(125.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation activity (in shares)		17,143
Stock-based compensation activity	3.9	$ 0.0	3.9
Net earnings (loss)	4.1				4.1
Other comprehensive income, net of tax	(13.2)					(13.2)
Ending balance, common stock outstanding (in shares) at Jun. 30, 2019		71,061,804		(542,874)
Ending balance, equity at Jun. 30, 2019	531.8	$ 0.7	702.0	$ (7.2)	(25.2)	(138.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation activity (in shares)		227,478
Stock-based compensation activity	5.1	$ 0.0	5.1
Net earnings (loss)	26.1				26.1
Other comprehensive income, net of tax	$ (33.8)					(33.8)
Ending balance, common stock outstanding (in shares) at Sep. 30, 2019	70,746,408	71,289,282		(542,874)
Ending balance, equity at Sep. 30, 2019	$ 529.2	$ 0.7	$ 707.1	$ (7.2)	$ 0.9	$ (172.3)