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Consolidated Statement of Shareholders' Equity - USD ($) $ in Millions		Total	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Common Stock [Member]
Consolidated Statement of Shareholders' Equity [Roll Forward]
Adjustments to Opening Balances - Net of Income Taxes	[1]	$ 0.5	$ 6.1	$ (5.6)	$ 0.0
Beginning Balance - Adjusted		2,068.7	695.5	(28.2)	1,401.4
Beginning Balance at Dec. 31, 2017		2,068.2	689.4	(22.6)	1,401.4
Comprehensive Income [Abstract]
Net Income		113.0	113.0
Other Comprehensive Income – Net of Tax [Abstract]
Unrealized Loss on Debt Securities		(0.1)		(0.1)
Defined Benefit Pension and Other Postretirement Plans		1.0		1.0
Total Comprehensive Income		113.9
Common Stock Issued		19.7			19.7
Dividends Declared		(86.2)	(86.2)
Ending Balance at Sep. 30, 2018		$ 2,116.1	$ 722.3	$ (27.3)	$ 1,421.1
[1] Reflects the impacts associated with the adoption of accounting standards concerning Financial Instruments, Revenue from Contracts with Customers and the Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. (See Note 1. Operations and Significant Accounting Policies.)

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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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