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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0.0	0.1	0.1	0.1
Earnings available to common stockholders	$ 64.9	$ 17.3	$ 127.3	$ 29.9
Weighted average basic shares outstanding	181.9	182.5	182.3	182.4
Earnings per share - basic	$ 0.36	$ 0.09	$ 0.70	$ 0.16
Earnings available to common stockholders, diluted	$ 64.9	$ 17.3	$ 127.3	$ 29.9
Dilutive impact of stock based awards	7.4	1.9	7.5	1.8
Weighted average dilutive shares outstanding	189.3	184.4	189.8	184.2
Earnings per share - diluted	$ 0.34	$ 0.09	$ 0.67	$ 0.16
Performance Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0.0	6.5	0.0	6.5

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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