CONDENSED STATEMENTS OF CHANGES IN STOCKHOLDER'S EQUITY (Unaudited) (USD $) In Millions, unless otherwise specified	Total	Common Stock	Premium on Common Stock	Retained Earnings
Balance at Dec. 31, 2013	$ 2,829.3us-gaap_StockholdersEquity	$ 100.9	$ 915.4	$ 1,813.0
Changes in Stockholders' Equity
Net income	20.7us-gaap_NetIncomeLoss	0	0	20.7
Dividends declared on common stock	(30.0)us-gaap_DividendsCommonStock	0	0	(30.0)
Stock-based compensation	0.8	0	0.8	0
Balance at Mar. 31, 2014	2,820.8us-gaap_StockholdersEquity	100.9	916.2	1,803.7
Balance at Dec. 31, 2014	3,004.2us-gaap_StockholdersEquity	100.9	918.3	1,985.0
Changes in Stockholders' Equity
Net income	17.1us-gaap_NetIncomeLoss	0	0	17.1
Dividends declared on common stock	(30.0)us-gaap_DividendsCommonStock	0	0	(30.0)
Stock-based compensation	0.8	0	0.8	0
Balance at Mar. 31, 2015	$ 2,992.1us-gaap_StockholdersEquity	$ 100.9	$ 919.1	$ 1,972.1

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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