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INVESTMENT IN TRANSMISSION AFFILIATES - SUMMARIZED FINANCIAL DATA (Details) - ATC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income statement data
Operating revenues	$ 184.9	$ 170.4	$ 544.8	$ 501.3
Operating expenses	94.7	87.9	278.7	264.3
Other expense, net	28.7	27.4	86.1	80.4
Net income	61.5	$ 55.1	180.0	$ 156.6
Balance sheet data
Current assets	84.9		84.9		$ 87.2
Noncurrent assets	5,178.8		5,178.8		4,928.8
Total assets	5,263.7		5,263.7		5,016.0
Current liabilities	493.3		493.3		640.0
Long-term debt	2,312.6		2,312.6		2,014.0
Other noncurrent liabilities	299.4		299.4		295.3
Shareholders' equity	2,158.4		2,158.4		2,066.7
Total liabilities and shareholders' equity	$ 5,263.7		$ 5,263.7		$ 5,016.0

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