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Common Equity Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Equity [Abstract]
Net income	$ 55.0	$ 36.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 55.0	$ 36.0
Basic average common shares outstanding	199.7	199.7
Contingently issuable shares (performance and restricted stock units)	0.5	0.3
Diluted average common shares outstanding	200.2	200.0
Earnings Per Share, Basic and Diluted [Abstract]
Basic earnings per average common share	$ 0.28	$ 0.18
Diluted earnings per average common share	$ 0.27	$ 0.18
Anti-dilutive shares excluded from earnings per share calculation	0.0	0.0

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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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