CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
CONSOLIDATED BALANCE SHEETS [Abstract]
Customers, allowance for credit losses	$ 10.3	$ 2.6
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	480,000,000.0	480,000,000.0
Common stock, shares outstanding	132,700,000	132,500,000