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 |