SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

12 Months Ended

Dec. 31, 2020

Supplemental Cash Flow Information [Abstract]

Schedule of supplemental cash flow information

	Year Ended December 31
(in millions)	2020		2019		2018
Cash paid for interest, net of amount capitalized	$	62.4	$	58.2	$	52.9
Cash paid (received) for income taxes, net	(16.9)		(33.9)		36.6
Significant non-cash investing and financing transactions:
Accounts payable related to construction costs	23.7		43.3		8.1
Receivable related to corporate-owned life insurance proceeds	—		—		6.4