STOCKHOLDERS' EQUITY (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Computation of diluted earnings:
Net income	$ 97.6	$ 83.1	$ 136.0	$ 109.3
Add: Interest expense from assumed conversion of convertible notes, net of tax	0.1	1.0	1.0	2.0
Net income for diluted earnings per share calculation	$ 97.7	$ 84.1	$ 137.0	$ 111.3
Computation of diluted weighted average shares outstanding:
Basic weighted average shares outstanding	42,321,267	45,429,998	42,999,281	45,623,470
Incremental shares from assumed exercise of stock options and vesting of restricted stock units	457,241	488,454	330,406	423,354
Incremental shares from assumed conversion of convertible debt	176,123	2,781,818	1,188,445	2,781,818
Diluted weighted average shares outstanding	42,954,631	48,700,270	44,518,132	48,828,642