Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($) $ in Millions	Jun. 27, 2020	Dec. 31, 2019	Jun. 29, 2019
Assets:
Cash Equivalents	$ 0.2	$ 0.3	$ 150.2
Short-Term Investments in Marketable Securities	0.8	0.8	0.8
Restricted Cash	11.6	11.6	11.6
Derivative Asset, Fair Value, Gross Asset	3.5	4.2	7.3
Total Assets	16.1	16.9	169.9
Liabilities:
Derivative Liability, Fair Value, Gross Liability	2.5	3.2	2.2
Deferred Compensation	16.4	20.0	28.4
Total Liabilities at Fair Value	18.9	23.2	30.6
Liabilities Measured at Net Asset Value	9.4	8.5	11.5
Total Liabilities	28.3	31.7	42.1
Level 1 [Member]
Assets:
Cash Equivalents	0.2	0.3	150.2
Short-Term Investments in Marketable Securities	0.8	0.8	0.8
Restricted Cash	11.6	11.6	11.6
Derivative Asset, Fair Value, Gross Asset	0.0	0.0	0.0
Total Assets	12.6	12.7	162.6
Liabilities:
Derivative Liability, Fair Value, Gross Liability	0.0	0.0	0.0
Deferred Compensation	0.9	1.2	2.7
Total Liabilities at Fair Value	0.9	1.2	2.7
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	3.5	4.2	7.3
Total Assets	3.5	4.2	7.3
Liabilities:
Derivative Liability, Fair Value, Gross Liability	2.5	3.2	2.2
Deferred Compensation	15.5	18.8	25.7
Total Liabilities at Fair Value	$ 18.0	$ 22.0	$ 27.9