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Common Equity Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Equity [Abstract]
Net Income	$ 43.2us-gaap_NetIncomeLoss	$ 49.3us-gaap_NetIncomeLoss
Basic average common shares outstanding	199.5us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	198.8us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Contingently issuable shares (performance and restricted stock units)	0us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares	0.7us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Diluted average common shares outstanding	199.5us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	199.5us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings Per Share, Basic and Diluted [Abstract]
Basic Earnings Per Average Common Share	$ 0.22us-gaap_EarningsPerShareBasic	$ 0.25us-gaap_EarningsPerShareBasic
Diluted Earnings Per Average Common Share	$ 0.22us-gaap_EarningsPerShareDiluted	$ 0.25us-gaap_EarningsPerShareDiluted
Anti-dilutive shares excluded from earnings per share calculation	0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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