XML 120 R99.htm IDEA: XBRL DOCUMENT v3.10.0.1
Valuation and Qualifying Accounts (Schedule of Valuation and Qualifying Accounts) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 27, 2018
Dec. 28, 2017
Dec. 29, 2016
Allowance for Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 6.0 $ 6.3 $ 5.6
Provision for bad debt 1.6 1.1 2.1
Write-offs, net (1.6) (1.4) (1.4)
Balance at end of period 6.0 6.0 6.3
Valuation Allowance On Deferred Tax Assets [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 98.1 110.3 110.4
Valuation allowance reversed (1) (18.0) (12.2) (0.1)
Balance at end of period $ 80.1 $ 98.1 $ 110.3