Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net loss	$ (22.0)	$ (3.0)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	119.5	71.0
Provision for loss on receivables	0.7	0.0
Noncash portion of interest expense	1.3	1.4
Deferred income taxes	(7.9)	(0.9)
Pension and other postretirement payments in excess of expense	(4.7)	(0.3)
Stock-based compensation	0.0	1.3
Other, net	1.2	(0.3)
Changes in operating assets and liabilities:
Decrease in receivables	83.7	61.5
Increase in inventory, materials, supplies, prepaid expenses and other current assets	(10.7)	(9.0)
Decrease in accounts payable	(50.8)	(33.9)
Decrease in accrued and other current liabilities	(14.4)	(30.8)
(Increase) decrease in other noncurrent assets	(3.0)	3.3
Decrease in other noncurrent liabilities	(3.8)	(0.5)
Net cash provided by operating activities	89.1	59.8
Cash flows from investing activities
Capital expenditures	(87.8)	(60.7)
Proceeds from sale of assets	2.1	0.0
Other, net	0.3	0.1
Net cash used in investing activities	(85.4)	(60.6)
Cash flows from financing activities
Net increase in corporate credit and receivables facilities with initial maturities less than 90 days	1.7	5.8
Repayment of debt	(5.9)	(5.8)
Dividends paid on preferred stock	0.0	(2.6)
Other, net	0.0	(2.0)
Net cash used in financing activities	(4.2)	(4.6)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	0.0	(0.1)
Net decrease in cash, cash equivalents and restricted cash	(0.5)	(5.5)
Cash, cash equivalents and restricted cash at beginning of period	6.1	17.2
Cash, cash equivalents and restricted cash at end of period	5.6	11.7
Noncash investing and financing transactions:
Acquisition of property by assuming debt and other noncurrent liabilities	0.8	3.5
Acquisition of property on account	$ 51.2	$ 29.2