Fair Value Measurements (Narrative) (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 06, 2014	Sep. 07, 2013	Sep. 06, 2014	Sep. 07, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of long-lived assets which were impaired during the period	$ 46.4	$ 22.7	$ 80.9	$ 52.8
Impairment charge	17.0	16.8	42.9	32.2
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of long-lived assets which were impaired during the period	$ 29.4	$ 5.9	$ 38.0	$ 20.6