Commitments and Contingencies (Narrative) (Details) $ in Millions				3 Months Ended
	Sep. 02, 2021 USD ($)	Oct. 12, 2020 USD ($)	Oct. 11, 2020 USD ($)	Apr. 01, 2022 USD ($) lawsuit	Dec. 31, 2021 USD ($)
Loss Contingencies [Line Items]
Settlement Warrants, Fair Value Disclosure				$ 0.0	$ 0.0
Liabilities subject to compromise (Note 2)				6,433.2	6,397.7
Environmental liabilities				105.8
Environmental liabilities				37.7	43.0
Crab Orchard National Wildlife Refuge Superfund Site
Loss Contingencies [Line Items]
Environmental liabilities				57.4
Environmental Remediation Expense				11.1
Medicaid Lawsuit [Member]
Loss Contingencies [Line Items]
Liabilities subject to compromise (Note 2)				634.7	634.7
Accrued and other current liabilities
Loss Contingencies [Line Items]
Environmental liabilities, current				1.2
Other Noncurrent Liabilities
Loss Contingencies [Line Items]
Interest Payable, Installment Sales					12.4
Liabilities Subject to Compromise
Loss Contingencies [Line Items]
Interest Payable, Installment Sales				12.4
Minimum
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss				82.3
Maximum
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss				$ 119.2
Medicaid Lawsuit [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded to Other Party, Post Closing Settlement Amount, Total		$ 260.0
Restructuring Support Agreement, Proposed Debt, Term			7 years
Medicaid Lawsuit [Member] | Maximum
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss			$ 640.0
Opioid crisis [Member] | Cities, Counties, and/or Other Government-related Persons/Entities [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs | lawsuit				2,619
Opioid crisis [Member] | Hospitals, Health Systems, Unions, Health and Welfare Fund or Third-Party Payers [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs | lawsuit				270
Opioid crisis [Member] | Individuals [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs | lawsuit				124
Opioid crisis [Member] | Schools and School Boards [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs | lawsuit				8
Opioid crisis [Member] | State Attorney Generals [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs | lawsuit				17
Opioid Claimant Trust [Member]
Loss Contingencies [Line Items]
Restructuring Support Agreement Proposed Settlement, Year Three through Seven			150.0
Restructuring Support Agreement Proposed Settlement, Year Eight	$ 125.0
Opioid Claimant Trust [Member] | Restructuring Support Agreement [Member]
Loss Contingencies [Line Items]
Litigation Settlement, Amount Awarded to Other Party, Settlement Closing Amount			450.0
Litigation Settlement, Amount Awarded to Other Party, Post Closing Settlement Amount, Year One & Two			200.0
Restructuring Support Agreement Proposed Settlement, Year Three through Seven			150.0
Restructuring Support Agreement Proposed Settlement, Year Eight	125.0
Opioid Claimant Trust [Member] | Maximum
Loss Contingencies [Line Items]
Loss Contingency Accrual				$ 1,725.0	$ 1,725.0
Opioid Claimant Trust [Member] | Maximum | Restructuring Support Agreement [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 1,725.0
Equity Value of Opioid Claimants' Ownership			$ 1,551.0
Senior Notes | 5.75% Senior Notes
Loss Contingencies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.75%
Senior Notes | 10.00% Second Lien Senior Notes
Loss Contingencies [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			10.00%
Other Ownership Interest [Member] | Opioid Claimant Trust [Member] | Maximum | Restructuring Support Agreement [Member]
Loss Contingencies [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners			19.99%