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Earnings per Common Share - Table 2 (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding (shares)	97.9	90.3	97.9	89.5
Convertible senior subordinated notes (shares)	0.0	7.5	0.0	8.1
Restricted stock awards, dilutive stock options, restricted stock units, and common stock warrants (shares)	1.7	1.1	1.7	1.4
Diluted weighted average common shares outstanding (shares)	99.6	98.9	99.6	99.0

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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