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Consolidated Statement of Shareholders' Equity Consolidated Statement of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]
Balance, Beginning Balance at Dec. 31, 2017		$ 1,401.4	$ (28.2)	$ 695.5
Consolidated Statement of Shareholders' Equity [Roll Forward]
Common Stock Issued		6.0
Unrealized Gain (Loss) on Debt Securities	$ (0.1)		(0.1)
Defined Benefit Pension and Other Postretirement Plans	(0.4)		(0.4)
Net Income				51.0
Common Stock Dividends	28.7			(28.7)
Balance, End of Period at Mar. 31, 2018	$ 2,097.3	1,407.4	(27.9)	717.8
Consolidated Statement of Shareholders' Equity [Roll Forward]
Dividends Per Share of Common Stock	$ 0.56
Balance, Beginning Balance at Dec. 31, 2018		1,428.5	(27.3)	754.6
Consolidated Statement of Shareholders' Equity [Roll Forward]
Common Stock Issued		2.6
Unrealized Gain (Loss) on Debt Securities	$ 0.1		0.1
Defined Benefit Pension and Other Postretirement Plans	0.0		0.0
Net Income				70.5
Common Stock Dividends	30.3			(30.3)
Balance, End of Period at Mar. 31, 2019	$ 2,198.7	$ 1,431.1	$ (27.2)	$ 794.8
Consolidated Statement of Shareholders' Equity [Roll Forward]
Dividends Per Share of Common Stock	$ 0.5875

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Aggregate dividends declared during the period for each share of common stock outstanding.

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