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Earnings per Common Share - Table 2 (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]          
Basic weighted average common shares outstanding (shares) 90.3   89.3 89.5 89.4
Convertible senior subordinated notes (shares) 7.5 8.6 8.5 8.1 8.5
Restricted stock awards, dilutive stock options, restricted stock units, and common stock warrants (shares) 1.1   1.6 1.4 1.5
Diluted weighted average common shares outstanding (shares) 98.9   99.4 99.0 99.4