GENERAL SIGNIFICANT ACCOUNTING POLICIES - CAPITAL CONSTRUCTION FUND (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Cash deposits	$ 105.5	$ 10.7
Qualifying cash withdrawal payments		10.7
Accounts receivable, net	283.0		$ 268.5
Eligible Accounts Receivable Assigned to CCF
Capital construction fund	623.7		518.2
Cash deposits	100.0	10.7
Interest earned	5.5
Qualifying cash withdrawal payments		(10.7)
Amount pledged to capital construction fund	200.0	$ 0.0
Accounts receivable, net	$ 209.9		$ 9.9
Weighted average life of securities held within the fund	35 days