Supplemental Cash Flow Information

9 Months Ended

Sep. 30, 2023

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

11.Supplemental Cash Flow Information

Noncash investing and financing activities are as follows:

	Nine Months Ended
	September 30,
	2023		2022
	(Dollars in Millions)
Accrued liabilities for purchases of property, plant and equipment	$	65.3	$	51.8
Remeasurement of operating lease right-of-use assets	$	6.1	$	(4.9	)
Remeasurement of finance lease right-of-use assets	$	—	$	(11.4	)
Right-of-use assets obtained in exchange for new    operating lease liabilities	$	36.9	$	23.4
Right-of-use assets obtained in exchange for    new finance lease liabilities	$	18.7	$	10.2
Acquisition of assets through asset exchange	$	5.2	$	—
Accounts payable relieved in connection with sale of property, plant and     equipment	$	0.7	$	—

Supplemental disclosures of cash flow information are as follows:

	Nine Months Ended
	September 30,
	2023		2022
	(Dollars in Millions)
Cash paid for interest, net of capitalized amount	$	121.1	$	126.3
Cash paid for income taxes, net of refunds	$	202.7	$	160.0