Retirement and Post Retirement Health Care Plans (Level 3 Plan Assets) (Details) $ in Millions	12 Months Ended
Dec. 28, 2019 USD ($)	Dec. 29, 2018 USD ($)
Change in Fair Value of Plan Assets:
Fair Value of Plan Assets at Beginning of Period	$ 174.0
Fair Value of Plan Assets at End of Period	203.4	$ 174.0
Level 3
Change in Fair Value of Plan Assets:
Fair Value of Plan Assets at Beginning of Period	10.3	9.6
Net Purchases (Sales)	(1.6)	0.6
Net Gains	1.2	0.1
Fair Value of Plan Assets at End of Period	9.9	10.3
Real Estate
Change in Fair Value of Plan Assets:
Fair Value	$ 9.9	$ 10.3
Exit Capitalization Rate \| Real Estate \| Level 3 \| Minimum
Change in Fair Value of Plan Assets:
Measurement Input	0.050	0.049
Exit Capitalization Rate \| Real Estate \| Level 3 \| Maximum
Change in Fair Value of Plan Assets:
Measurement Input	0.070	0.070
Discount Rate \| Real Estate \| Level 3 \| Minimum
Change in Fair Value of Plan Assets:
Measurement Input	0.065	0.066
Discount Rate \| Real Estate \| Level 3 \| Maximum
Change in Fair Value of Plan Assets:
Measurement Input	0.080	0.078

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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- Definition

Value of input used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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