Fair Value Measurements (Reconciliaiton of the Beginning and Ending Balances for Level 3 Liabilities) (Details) (Significant Unobservable Inputs (Level 3) [Member], Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 15, 2013
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 29, 2012	$ 21.8
Settlements	(0.9)
Unrealized losses	(0.9)
Balance at June 15, 2013	$ 20.0