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Equity - Rollforward (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity
Beginning balance (shares)		41,826,136			41,826,136
Beginning balance	$ 502.1	$ 530.8	$ 358.7	$ 338.7	$ 530.8	$ 338.7
Net income (loss)	20.2	45.3	56.8	22.7	$ 65.5	79.5
Other comprehensive income (loss)	(4.1)	(39.1)	(19.4)	9.1
Exercise of stock options, net	1.4		0.2	1.4
Tax payments related to vested restricted stock units	0.1	(3.1)		(14.3)
Share repurchase program		(32.4)		(3.3)
Share-based compensation plans	$ 3.2	1.2	4.4	4.4
Ending balance (shares)	41,259,085				41,259,085
Ending balance	$ 522.9	502.1	$ 400.7	$ 358.7	$ 522.9	$ 400.7
Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity
Beginning balance		$ (0.6)			$ (0.6)
Common Stock
Increase (Decrease) in Stockholders' Equity
Beginning balance (shares)	42,836,000	42,675,000	42,659,000	42,332,000	42,675,000	42,332,000
Beginning balance	$ 0.4	$ 0.4	$ 0.4	$ 0.4	$ 0.4	$ 0.4
Common stock issued (shares)	5,000	161,000	5,000	276,000
Exercise of stock options, net (shares)	50,000		6,000	51,000
Ending balance (shares)	42,891,000	42,836,000	42,670,000	42,659,000	42,891,000	42,670,000
Ending balance	$ 0.4	$ 0.4	$ 0.4	$ 0.4	$ 0.4	$ 0.4
Additional paid in capital
Increase (Decrease) in Stockholders' Equity
Beginning balance	113.6	112.8	103.8	98.3	112.8	98.3
Exercise of stock options, net	1.4		0.2	1.4
Share-based compensation plans	1.3	0.8	3.5	4.1
Ending balance	116.3	113.6	107.5	103.8	116.3	107.5
Retained earnings
Increase (Decrease) in Stockholders' Equity
Beginning balance	541.9	497.2	336.2	313.5	497.2	313.5
Net income (loss)	20.2	45.3	56.8	22.7
Ending balance	562.1	541.9	393.0	336.2	562.1	393.0
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity
Beginning balance		(0.6)			(0.6)
Accumulated other comprehensive income (loss)
Increase (Decrease) in Stockholders' Equity
Beginning balance	(44.1)	(5.0)	(8.6)	(17.7)	(5.0)	(17.7)
Other comprehensive income (loss)	(4.1)	(39.1)	(19.4)	9.1
Ending balance	(48.2)	(44.1)	(28.0)	(8.6)	(48.2)	(28.0)
Treasury stock
Increase (Decrease) in Stockholders' Equity
Beginning balance	(109.7)	(74.6)	(73.1)	(55.8)	(74.6)	(55.8)
Tax payments related to vested restricted stock units	0.1	(3.1)		(14.3)
Share repurchase program		(32.4)	0.9	(3.3)
Share-based compensation plans	1.9	0.4		0.3
Ending balance	$ (107.7)	$ (109.7)	$ (72.2)	$ (73.1)	$ (107.7)	$ (72.2)

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