Retirement and Other Employee Benefits (Fair Values of Plan Assets by Asset Category) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 28, 2012		Dec. 30, 2011		Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	$ 13.6		$ 12.2
US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0.1
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	4.8		3.6
Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0.1		1.0
Value Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	4.3		3.2
Growth Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	3.6		4.4
Commodity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0.7
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	13.5		12.2
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	4.8		3.6
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0.1		1.0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Value Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	4.3		3.2
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Growth Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	3.6		4.4
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commodity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0.7
Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0.1		0
Significant Observable Inputs (Level 2) [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0.1
Significant Observable Inputs (Level 2) [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Observable Inputs (Level 2) [Member] | Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Observable Inputs (Level 2) [Member] | Value Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Observable Inputs (Level 2) [Member] | Growth Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Observable Inputs (Level 2) [Member] | Commodity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | US Treasury and Government [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Value Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Growth Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
Significant Unobservable Inputs (Level 3) [Member] | Commodity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
UNITED STATES Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	13.5	[1]	12.2	[1]	12.1	[1]
UNITED KINGDOM [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	45.6		39.3
UNITED KINGDOM [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0.6		0.5
UNITED KINGDOM [Member] | United Kingdom Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	18.8		16.5
UNITED KINGDOM [Member] | United States Companies [Membeer]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	5.5		5.0
UNITED KINGDOM [Member] | Other International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	10.9		8.8
UNITED KINGDOM [Member] | United Kingdom Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	4.8		5.1
UNITED KINGDOM [Member] | United Kingdom Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	5.0		3.4
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	45.6		39.3
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0.6		0.5
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | United Kingdom Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	18.8		16.5
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | United States Companies [Membeer]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	5.5		5.0
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	10.9		8.8
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | United Kingdom Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	4.8		5.1
UNITED KINGDOM [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | United Kingdom Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	5.0		3.4
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member] | United Kingdom Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member] | United States Companies [Membeer]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member] | Other International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member] | United Kingdom Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Observable Inputs (Level 2) [Member] | United Kingdom Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member] | United Kingdom Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member] | United States Companies [Membeer]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member] | United Kingdom Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Significant Unobservable Inputs (Level 3) [Member] | United Kingdom Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
UNITED KINGDOM [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	$ 45.6	[1]	$ 39.3	[1]	$ 40.4	[1]

[1] The accumulated benefit obligation is the same as the projected benefit obligation.