Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Numerator:
Net Income	$ 79.1	$ 78.6
Net loss	(6.4)	0.0
Net income	85.5	78.6
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	(1.5)	(1.4)
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted	(1.5)	(1.4)
Net Income (Loss) Available to Common Stockholders, Basic	84.0	77.2
Net Income (Loss) Available to Common Stockholders, Diluted	$ 84.0	$ 77.2
Denominator:
Denominator for basic earnings per share — weighted average shares	35.7	35.9
Basic earnings per share from consolidated operations (in dollars per share)	$ 2.35	$ 2.15
Effect of dilutive securities:
Equity compensation plans	0.1	0.1
Weighted-average shares outstanding - diluted	35.8	36.0
Diluted earnings per share (in dollars per share)	$ 2.35	$ 2.15