Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2021

Commitments And Contingencies Disclosure [Abstract]

Schedule of Changes in Asset Retirement Obligations

The following shows the changes in the asset retirement obligations:

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

Schedule of Contractual Purchase Commitments

The Company’s contractual purchase commitments as of December 31, 2021 are as follows:

(in millions)
2022	$	161.3
2023		36.5
2024		25.8
2025		8.4
2026		7.8
Thereafter		56.6
Total	$	296.4

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, 2021 are as follows:

(in millions)	Contracts of Affreightment		Royalty Commitments
2022	$	51.9	$	22.8
2023		28.2		14.3
2024		23.5		13.0
2025		23.8		11.2
2026		17.4		9.2
Thereafter		17.7		75.4
Total	$	162.5	$	145.9