Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net income to common shareholders	$ 41.5	$ 15.2
Basic weighted average shares outstanding (in shares)	224.7	233.9
Diluted weighted average shares outstanding (in shares)	225.2	234.7
Net income per common share:
Basic net income per share (in dollars per share)	$ 0.18	$ 0.06
Diluted net income per share (in dollars per share)	$ 0.18	$ 0.06
Antidilutive securities excluded from computation of earnings per share (in shares)	1.0	1.5