CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 594.7	$ 510.9	$ 386.0
Other comprehensive income (loss):
Reclassification adjustment transferred to Net income from cash flow hedges	0.5	0.1	0.1
Pension and other postretirement benefit costs, net of tax	(8.6)	3.9	2.8
Total Comprehensive Income	$ 586.6	$ 514.9	$ 388.9