Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 28, 2021	Dec. 27, 2020	Mar. 29, 2020
Revenue from Contract with Customer [Abstract]
Contract assets - current	$ 257.9	$ 284.4	$ 271.0
Contract assets - long term	70.0	77.0	87.5
Total	327.9	361.4	358.5
Contract liabilities - current	146.9	161.0	185.6
Contract liabilities - long term	16.6	18.2	20.6
Total	$ 163.5	$ 179.2	$ 206.2

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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