Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions	Sep. 26, 2020	Dec. 31, 2019	Sep. 28, 2019
Assets:
Cash Equivalents	$ 0.3	$ 0.3	$ 0.2
Short-Term Investments in Marketable Securities	0.8	0.8	0.8
Restricted Cash	9.1	11.6	11.6
Derivative Asset, Fair Value, Gross Asset	2.6	4.2	11.7
Total Assets	12.8	16.9	24.3
Liabilities:
Derivative Liability, Fair Value, Gross Liability	3.7	3.2	1.8
Deferred Compensation	17.3	20.0	21.7
Total Liabilities at Fair Value	21.0	23.2	23.5
Liabilities Measured at Net Asset Value	10.1	8.5	10.3
Total Liabilities	31.1	31.7	33.8
Level 1 [Member]
Assets:
Cash Equivalents	0.3	0.3	0.2
Short-Term Investments in Marketable Securities	0.8	0.8	0.8
Restricted Cash	9.1	11.6	11.6
Derivative Asset, Fair Value, Gross Asset	0.0	0.0	0.0
Total Assets	10.2	12.7	12.6
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0.0	0.0	0.0
Deferred Compensation	0.8	1.2	1.1
Total Liabilities at Fair Value	0.8	1.2	1.1
Level 2 [Member]
Assets:
Cash Equivalents	0.0	0.0	0.0
Short-Term Investments in Marketable Securities	0.0	0.0	0.0
Restricted Cash	0.0	0.0	0.0
Derivative Asset, Fair Value, Gross Asset	2.6	4.2	11.7
Total Assets	2.6	4.2	11.7
Liabilities:
Derivative Liability, Fair Value, Gross Liability	3.7	3.2	1.8
Deferred Compensation	16.5	18.8	20.6
Total Liabilities at Fair Value	$ 20.2	$ 22.0	$ 22.4