EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings per share
Income (loss) from continuing operations	$ 47.5	$ 22.0	$ 159.5	$ (5.9)
Income (loss) from discontinued operations – net of tax	0.0	(0.1)	0.0	(1.3)
Gain (loss) on disposition of discontinued operations – net of tax	0.6	(16.1)	2.6	(21.1)
Net income (loss)	$ 48.1	$ 5.8	$ 162.1	$ (28.3)
Basic shares:
Weighted average shares outstanding - basic (in shares)	69.8	69.3	69.7	69.7
Earnings (loss) per share – basic:
Income (loss) from continuing operations	$ 0.68	$ 0.31	$ 2.29	$ (0.09)
Income (loss) from discontinued operations – net of tax	0	0	0	(0.02)
Gain (loss) on disposition of discontinued operations – net of tax	0.01	(0.23)	0.04	(0.30)
Net income (loss)	$ 0.69	$ 0.08	$ 2.33	$ (0.41)
Diluted shares:
Weighted average shares outstanding - basic (in shares)	69.8	69.3	69.7	69.7
Effect of dilutive securities:
Stock options and restricted stock awards (in shares)	1.1	0.2	1.1	0.0
Diluted weighted average shares outstanding (in shares)	70.9	69.5	70.8	69.7
Earnings (loss) per share – diluted:
Income (loss) from continuing operations	$ 0.67	$ 0.31	$ 2.25	$ (0.09)
Income (loss) from discontinued operations – net of tax	0	0	0	(0.02)
Gain (loss) on disposition of discontinued operations – net of tax	0.01	(0.23)	0.04	(0.30)
Net income (loss)	$ 0.68	$ 0.08	$ 2.29	$ (0.41)
Restricted Stock
Earnings (loss) per share – diluted:
Antidilutive securities excluded from computation of earnings per share (in shares)	0.1	0.9	0.1	2.0