Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2022

Commitments and Contingencies Disclosure [Abstract]

Schedule of Changes in Asset Retirement Obligations

The following shows the changes in asset retirement obligations:

years ended December 31 (in millions)	2022			2021			2020
Balance at beginning of year	$	306.8		$	153.8		$	143.9
Accretion expense		10.6			7.2			5.9
Liabilities incurred and liabilities assumed in business combinations		78.6			179.0			0.3
Liabilities settled		(14.1	)		(5.2	)		(10.3	)
Revisions in estimated cash flows		(3.1	)		3.5			14.0
Liabilities reclassified from/(to) assets held for sale		1.2			(31.5	)		—
Balance at end of year	$	380.0		$	306.8		$	153.8

Schedule of Contractual Purchase Commitments

The Company’s contractual purchase commitments as of December 31, 2022 are as follows:

(in millions)
2023	$	196.2
2024		35.0
2025		24.8
2026		10.5
2027		8.5
Thereafter		53.5
Total	$	328.5

Schedule of Future Minimum Contracts of Affreightment and Royalty Commitments for All Noncancelable Agreements

Future minimum contracts of affreightment and royalty commitments for all noncancelable agreements that are not accounted for as leases on the Company’s consolidated balance sheet as of December 31, 2022 are as follows:

(in millions)	Contracts of Affreightment		Royalty Commitments
2023	$	28.1	$	24.1
2024		16.9		15.4
2025		17.1		12.8
2026		17.4		10.9
2027		17.7		10.3
Thereafter		—		82.8
Total	$	97.2	$	156.3