Financial Instruments and Fair Value Measurements (Schedule of Carrying Amount and Fair Value of Long-term Debt) (Details) - USD ($) $ in Millions	Mar. 27, 2020	Dec. 27, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term Debt, Current Maturities	$ 634.5	$ 634.5
Total debt, fair value	3,353.5	3,840.8
Long-term Debt	4,783.4	4,788.3
Total Debt	5,417.9	5,422.8
Secured Debt \| Term Loan due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term Debt, Current Maturities	15.6	15.6
Loans Payable	1,516.9	1,520.8
Long-term Debt	1,501.3	1,505.2
Loans Payable, Fair Value Disclosure	1,026.3	1,240.0
Secured Debt \| 2017 Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	900.0	900.0
Long-term Debt	900.0	900.0
Secured Debt \| Term Loan due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term Debt, Current Maturities	4.1	4.1
Loans Payable	402.6	403.6
Long-term Debt	398.5	399.5
Loans Payable, Fair Value Disclosure	270.2	326.2
Unsecured Debt \| 4.88% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term Debt, Current Maturities	614.8	614.8
Total debt, fair value	408.9	480.0
Long-term Debt		614.8
Unsecured Debt \| 5.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	283.3	251.0
Long-term Debt	610.3	610.3
Unsecured Debt \| 4.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	28.8	53.7
Long-term Debt	133.7	133.7
Unsecured Debt \| 5.625% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	131.2	193.2
Long-term Debt	514.7	514.7
Unsecured Debt \| 5.50% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	76.1	135.5
Long-term Debt	387.2	387.2
Unsecured Debt \| 10.00% Second Lien Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	221.9	253.8
Long-term Debt	$ 322.9	322.9
Senior Notes \| 4.88% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	4.875%
Senior Notes \| 5.75% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Debt Instrument, Interest Rate, Stated Percentage	5.75%
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
Total debt, fair value	$ 5.2	5.4
Long-term Debt	10.4	10.4
Debentures \| 8.00% Debenture
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total debt, fair value	1.6	2.0
Long-term Debt	$ 4.4	$ 4.4
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%

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Section S99
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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Period Type:	instant

- Definition

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

+ References

No definition available.

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Name:	us-gaap_DebtLongtermAndShorttermCombinedAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

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.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
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Balance Type:	credit
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- Definition

Fair value portion of contractual obligation to pay money on demand or on fixed or determinable dates.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

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- Definition

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.

+ References

No definition available.

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