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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Prior service cost and unrecognized loss during the period, tax	$ 7.9	$ 42.2	$ 15.4
Realized settlement loss, tax	1.7
Realized curtailment loss, tax			0.3
Less amortization of prior service costs and unrecognized loss included in net periodic benefit cost, tax	$ 19.9	$ 11.3	$ 7.3

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