CONSOLIDATED STATEMENTS OF CHANGES IN COMMON STOCK EQUITY - USD ($) $ in Millions	Total	Common Equity	Retained Earnings
Beginning Balance at Dec. 31, 2017	$ 336.6	$ 275.8	$ 60.8
Net Income	33.0		33.0
Dividends on Common Shares	(21.8)		(21.8)
Shares Issued Under Stock Plans	2.1	2.1
Issuance of Common Shares	1.2	1.2
Ending Balance at Dec. 31, 2018	351.1	279.1	72.0
Net Income	44.2		44.2
Dividends on Common Shares	(22.1)		(22.1)
Shares Issued Under Stock Plans	2.3	2.3
Issuance of Common Shares	1.1	1.1
Ending Balance at Dec. 31, 2019	376.6	282.5	94.1
Net Income	32.2		32.2
Dividends on Common Shares	(22.6)		(22.6)
Shares Issued Under Stock Plans	1.7	1.7
Issuance of Common Shares	1.1	1.1
Ending Balance at Dec. 31, 2020	$ 389.0	$ 285.3	$ 103.7