Earnings per Common Share - Table 2 (Details) - shares shares in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	89.5	87.1
Convertible perpetual preferred stock	0.0	3.2
Convertible senior subordinated notes	8.4	8.2
Restricted stock awards, dilutive stock options, restricted stock units, and common stock warrants	1.5	2.6
Diluted weighted average common shares outstanding	99.4	101.1

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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 convertible preferred stock 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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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