Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 27, 2014	Dec. 28, 2013
Accounts receivable, allowances	$ 34.5	$ 32.9
Long-term receivables, allowances	$ 13.1	$ 20.5
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	200,000,000us-gaap_PreferredStockSharesAuthorized	200,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	600,000,000us-gaap_CommonStockSharesAuthorized	600,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	63,607,090us-gaap_CommonStockSharesIssued	63,607,090us-gaap_CommonStockSharesIssued
Treasury stock, shares	13,924,568us-gaap_TreasuryStockShares	13,282,929us-gaap_TreasuryStockShares

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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