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Retirement Plans - Changes in Company's Assets and Related Obligations for its Pension Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Change in projected benefit obligations:
Projected benefit obligations at beginning of the year	$ 348.8	$ 443.4
Interest cost on projected benefit obligations	15.2	16.5	$ 17.7
Actuarial loss (gain)	45.4	(31.6)
Benefits paid to plan participants	(13.9)	(19.2)
Service cost pertaining to benefits earned during the year	5.5	6.3	7.2
Settlement	0.0	(66.6)
Projected benefit obligations at end of the year	401.0	348.8	443.4
Change in fair value of pension assets:
Fair value of pension assets at beginning of the year	254.4	299.6
Actual return (loss) on plan assets	44.7	(22.6)
Benefits paid to plan participants	(13.9)	(19.2)
Settlement	0.0	(66.6)
Fair value of pension assets at end of the year	287.6	254.4	299.6
Funded status	(113.4)	(94.4)
Amounts recognized in the consolidated balance sheets:
Noncurrent assets	0.0	1.4
Current liabilities	(3.7)	(3.8)
Noncurrent liabilities	(109.7)	(92.0)
Net amount recognized	(113.4)	(94.4)
Funded status of pension plans and SERP (supplemental):
Funded status of qualified defined benefit plans and SERP	(113.4)	(94.4)
Nonqualified trust assets	66.8	64.4
Net funded status of pension plans and SERP (supplemental)	(53.8)	(37.0)
Settlement loss	0.0	7.2	$ 0.0
Pension [Member]
Change in fair value of pension assets:
Company contributions	0.0	60.7
SERP [Member]
Change in fair value of pension assets:
Company contributions	2.4	2.5
Funded status of pension plans and SERP (supplemental):
Nonqualified trust assets	$ 59.6	$ 57.4

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(24))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

No definition available.

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