Stock-Based Compensation - Stock Award Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Stock-based compensation
Total stock-based compensation cost incurred	$ 34.4	$ 32.8	$ 31.5
Capitalized cost during the period	(1.9)	(3.3)	(4.5)
Amortization of capitalized cost during the period	2.3	3.4	4.7
Total stock-based compensation expense	34.8	32.9	31.7
Income tax benefit	17.8	18.7	11.4
Stock option awards
Stock-based compensation
Total stock-based compensation cost incurred	13.1	14.0	14.4
Restricted stock awards
Stock-based compensation
Total stock-based compensation cost incurred	10.8	9.4	8.3
Performance share awards
Stock-based compensation
Total stock-based compensation cost incurred	$ 10.5	$ 9.4	$ 8.8