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Earnings per Common Share - Reconciliation of Weighted Average Number of Shares Outstanding (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding (shares)	97.8	98.0	98.1	97.9
Restricted stock awards, dilutive stock options, restricted stock units, and common stock warrants (shares)	1.6	2.0	1.4	1.8
Diluted weighted average common shares outstanding (shares)	99.4	100.0	99.5	99.7

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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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