Description of Business and Accounting Policies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Description of Business and Accounting Policies [Line Items]
Insurance proceeds received for damage to equipment	$ 3.2		$ 0.1
Other current liabilities	33.4	$ 42.0
Other noncurrent liabilities	126.0	127.9
Effective income tax rate reconciliation, disposal group	16.4
Income tax expense (benefit)	18.5
Changes in federal valuation allowances on deferred tax assets	20.0
Income tax expense (benefit)	33.8		(4.6)
Loss from continuing operations before income taxes	13.9		$ 78.0
Benefit expected at statutory rates	2.9
Involuntary Events and Contingencies [Member]
Description of Business and Accounting Policies [Line Items]
Insurance proceeds received for damage to equipment	3.0
General insurance liability	2.2	4.0
Other current liabilities	0.2	2.0
Other noncurrent liabilities	2.0	2.0
Legal expense	2.0
Involuntary Events and Contingencies [Member] | Other Noncurrent Assets [Member]
Description of Business and Accounting Policies [Line Items]
Offsetting receivable	$ 2.0	2.0
Involuntary Events and Contingencies [Member] | Accounts Payable [Member]
Description of Business and Accounting Policies [Line Items]
Insurance voluntary fund		$ 2.5