Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Financial Instruments and Fair Value Measurements (Schedule of Carrying Amount and Fair Value of Long-term Debt) (Details) - USD ($) $ in Millions	Mar. 26, 2021	Dec. 25, 2020	Oct. 11, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term Debt, Current Maturities	$ 1,717.9	$ 3,622.6
Total debt, fair value	4,574.3	3,944.3
Long-term Debt	0.0	0.0
Total Debt	5,164.4	5,283.3
Unsecured Debt	1,660.7	1,660.7
Secured Debt	3,503.7	3,622.6
9.50% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	4.2	4.2
Unsecured Debt	10.4	10.4
5.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	407.7	191.2
Unsecured Debt	610.3	610.3
8.00% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	1.3	1.3
Unsecured Debt	4.4	4.4
4.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	26.2	11.1
Unsecured Debt	133.7	133.7
5.625% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	337.1	158.9
Unsecured Debt	514.7	514.7
Term Loan due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Secured Debt	1,411.2	1,505.2
5.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	258.1	115.4
Unsecured Debt	387.2	387.2
10.00% Second Lien Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	321.8	279.0
Secured Debt	322.9	322.9
Term Loan due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	369.8	367.9
Secured Debt	374.6	399.5
10.00% First Lien Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	553.4	528.4
Secured Debt	495.0	495.0
2017 Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	900.0	900.0
Secured Debt	900.0	900.0
Term Loan due Sept 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	1,394.7	1,386.9
Secured Debt	$ 1,411.2	$ 1,505.2
Unsecured Debt \| 5.625% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	5.625%
Senior Notes \| 5.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	5.75%
Senior Notes \| 4.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Senior Notes \| 5.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Senior Notes \| 10.00% Second Lien Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage			10.00%
Debentures \| 9.50% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	9.50%
Debentures \| 8.00% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	8.00%
Level 1 \| Unsecured Debt \| 5.625% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	5.625%
Level 1 \| Senior Notes \| 4.88% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	4.875%
Level 1 \| Senior Notes \| 5.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	5.75%
Level 1 \| Senior Notes \| 4.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Level 1 \| Senior Notes \| 5.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Level 1 \| Senior Notes \| 10.00% Second Lien Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	10.00%
Level 2 \| Debentures \| 9.50% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	9.50%
Level 2 \| Debentures \| 8.00% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	8.00%