Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net income	$ 75.8	$ 36.5
Denominator:
Denominator for basic earnings per share — weighted average shares	35.5	35.2
Effect of dilutive securities:
Equity compensation plans	0.5	0.7
Weighted-average shares outstanding - diluted	36.0	35.9
Basic earnings per share from consolidated operations (in dollars per share)	$ 2.13	$ 1.04