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INVESTMENT IN TRANSMISSION AFFILIATES - SUMMARIZED FINANCIAL DATA (Details) - ATC - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income statement data
Operating revenues	$ 170.4	$ 171.1	$ 501.3	$ 522.4
Operating expenses	87.9	85.3	264.3	251.0
Other expense, net	27.4	27.2	80.4	78.7
Net income	55.1	$ 58.6	156.6	$ 192.7
Balance sheet data
Current assets	95.3		95.3		$ 87.7
Noncurrent assets	4,857.6		4,857.6		4,598.9
Total assets	4,952.9		4,952.9		4,686.6
Current liabilities	640.6		640.6		767.2
Long-term debt	2,013.9		2,013.9		1,790.6
Other noncurrent liabilities	313.6		313.6		240.3
Shareholders' equity	1,984.8		1,984.8		1,888.5
Total liabilities and shareholders' equity	$ 4,952.9		$ 4,952.9		$ 4,686.6

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