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Net Income from Continuing Operations Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share, Basic and Diluted [Abstract]    
Net income from continuing operations $ 2.8 $ 15.3
Shares outstanding    
Weighted average common shares outstanding 129.0 133.1
Effect of dilutive stock options and restricted stock awards 1.0 0.7
Weighted average common shares outstanding and potential common shares 130.0 133.8
Net income from continuing operations per share    
Basic $ 0.02 $ 0.11
Diluted $ 0.02 $ 0.11
Options excluded from calculation of diluted net income per share 0.0 0.0
Securities excluded from calculation of earnings per share amount due to performance conditions not yet satisfied 0.4 0.8
Stock options outstanding (in shares) 0.7 1.0