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Consolidated Statement of Shareholders' Equity - 3 months ended Mar. 31, 2017 - USD ($) $ in Millions	Total	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Common Stock [Member]
Beginning Balance at Dec. 31, 2016	$ 1,893.0	$ 625.9	$ (28.2)	$ 1,295.3
Comprehensive Income [Abstract]
Net Income	49.0	49.0
Other Comprehensive Income – Net of Tax [Abstract]
Unrealized Gain on Securities	0.3		0.3
Defined Benefit Pension and Other Postretirement Plans	0.2		0.2
Total Comprehensive Income	49.5
Common Stock Issued	85.9			85.9
Dividends Declared	(26.9)	(26.9)
Ending Balance at Mar. 31, 2017	$ 2,001.5	$ 648.0	$ (27.7)	$ 1,381.2

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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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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