EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Basic earnings per share numerator:
Net income	$ 385.7	$ 250.6
Net income allocated to participating securities	(1.6)	(1.2)
Net income allocated to common stockholders	$ 384.1	$ 249.4
Basic earnings per share denominator:
Weighted average shares outstanding (in shares)	104,700,000	104,700,000
Basic earnings per share (in USD per share)	$ 3.67	$ 2.38
Diluted earnings per share numerator:
Net income allocated to participating securities	$ (1.6)	$ (1.2)
Net income allocated to common stockholders	$ 384.1	$ 249.4
Diluted earnings per share denominator:
Weighted average shares outstanding (in shares)	104,700,000	104,700,000
Dilutive common shares issued under stock program (in shares)	300,000	400,000
Total dilutive weighted average shares (in shares)	105,000,000.0	105,100,000
Diluted earnings per share (in USD per share)	$ 3.66	$ 2.37
Anti-dilutive shares excluded from the computation of diluted earnings per share (in shares)	0	0