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Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
OPERATING ACTIVITIES
Net income	$ 62.9	$ 17.0	$ 239.2	$ 38.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation expense	31.7	25.8	88.2	73.6
Accretion of discount on the Notes Receivable from ARO			(33.8)	(21.2)
Share-based compensation expense			22.4	19.5
Equity in losses (earnings) of ARO	(23.8)	2.4	(21.7)	5.0
Deferred income tax expense	3.8	(4.8)	19.3	2.3
Net (gain) loss on sale of property			0.3	(27.9)
Loss on extinguishment of debt	0.0	0.0	0.0	29.2
Changes in contract liabilities			(13.5)	(3.9)
Changes in deferred costs			32.6	(29.3)
Other			5.0	5.2
Changes in other operating assets and liabilities			(131.0)	94.5
Contributions to pension plans and other post-retirement benefits			(19.6)	(4.5)
Net cash provided by operating activities			230.8	170.8
INVESTING ACTIVITIES
Additions to property and equipment			(343.4)	(233.1)
Net proceeds from disposition of assets			0.2	29.2
Net cash used in investing activities			(343.2)	(203.9)
FINANCING ACTIVITIES
Payments for share repurchases			(101.4)	(147.4)
Payments related to tax withholdings for share-based awards			(29.7)	(5.2)
Issuance of Second Lien Notes			0.0	1,103.0
Redemption of First Lien Notes			0.0	(571.8)
Debt issuance costs			0.0	(36.7)
Net cash provided by (used in) financing activities			(131.1)	341.9
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH			(243.5)	308.8
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD			635.7	748.5
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	$ 392.2	$ 1,057.3	$ 392.2	$ 1,057.3

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