EARNINGS (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income	$ 17.7	$ 13.0	$ 35.3	$ (7.3)	$ 30.7	$ 28.0
Less Series A Preferred Stock dividends	(1.2)		(1.3)		(2.5)	(2.5)
Net income attributable to common stockholders	(16.5)		34.0		28.2	25.5
Allocation of earnings to non-vested participating RSUs	(0.2)		(0.3)		(0.3)	(0.2)
Numerator for basic EPS - loss available to common stockholders - two class method	(16.3)		33.7		27.9	25.3
Numerator for diluted EPS - loss available to common shareholders - two class method	(17.5)		35.0		30.4	25.3
Add back allocation earnings to participating securities	0.2		0.3		0.3	0.2
Reallocation of earnings to participating securities considering potentially dilutive securities	$ (0.2)		$ (0.3)		$ (0.3)	$ (0.2)
Denominator:
Denominator for basic EPS - weighted-average shares	63,470,040		64,842,620		63,182,277	64,960,833
Denominator for diluted EPS - weighted-average shares	71,555,039		71,866,303		71,319,113	66,154,571
Basic earnings per share	$ 0.26		$ 0.52		$ 0.44	$ 0.39
Diluted earnings per share	$ 0.24		$ 0.49		$ 0.43	$ 0.38
Stock Option
Denominator:
Weighted-average shares outstanding - Equivalent	2,432,826		1,371,510		2,484,663	1,193,738
Series A
Numerator:
Less Series A Preferred Stock dividends	$ (1.2)		$ (1.3)		$ (2.5)	$ (2.5)
Net income attributable to common stockholders	(16.5)		34.0		28.2	25.5
Add back series A Preferred Stock dividends	$ 1.2		$ 1.3		$ 2.5	$ 0.0
Denominator:
Weighted-average shares outstanding - Equivalent	5,652,173		5,652,173		5,652,173	0
Preferred stock dividend rate (as a percent)						7.625%