Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	[1]
Cash flows from operating activities
Net loss	$ (46.4)	$ (75.2)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	171.9	163.4
Provision for credit loss on receivables	5.8	4.8
Unrealized loss (gain) on interest rate swaps	7.9	(15.4)
Noncash portion of interest expense	4.1	5.3
Deferred income taxes	1.3	30.1
Pension and other postretirement payments in excess of expense	(7.6)	(5.5)
Settlement adjustment on sale of discontinued operations	14.5	0.0
Other, net	(1.4)	(5.3)
Changes in operating assets and liabilities:
(Increase) decrease in receivables	(3.9)	115.4
Decrease in inventory, materials, supplies, prepaid expenses and other current assets	4.4	12.2
Decrease in accounts payable	(23.4)	(92.3)
Decrease in accrued and other current liabilities	(48.2)	(4.3)
Increase in other noncurrent assets	(6.3)	(6.7)
(Decrease) increase in other noncurrent liabilities	(2.7)	2.2
Net cash provided by operating activities	70.0	128.7
Cash flows from investing activities
Capital expenditures	(286.3)	(296.6)
Final selling price adjustment from sale of discontinued operations	(14.5)	0.0
Proceeds from sale of assets	5.8	0.0
Insurance proceeds received for damage to equipment	0.5	3.3
Other, net	(0.2)	(1.1)
Net cash used in investing activities	(294.7)	(294.4)
Cash flows from financing activities
Proceeds from issuance of long-term debt	6.5	306.0
Net decrease in corporate credit facility with initial maturities less than 90 days	0.0	(105.5)
Proceeds from borrowings on receivables facilities	0.0	761.3
Payments on receivables facilities	0.0	(772.0)
Repayment of debt	(54.5)	(15.5)
Payment of debt issuance costs	(0.6)	(3.7)
Net cash (used in) provided by financing activities	(48.6)	170.6
Net (decrease) increase in cash, cash equivalents and restricted cash	(273.3)	4.9
Cash, cash equivalents and restricted cash at beginning of period	465.8	12.5
Cash, cash equivalents and restricted cash at end of period	192.5	17.4
Noncash investing and financing transactions:
Acquisition of property by assuming debt and other noncurrent liabilities	0.0	3.6
Acquisition of property on account	$ 69.1	$ 61.8

[1] Cash flows information includes cash flows from discontinued operations for the six months ended June 30, 2024.