Retirement and Other Employee Benefits (Fair Values of Plan Assets by Asset Category) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 30, 2011		Dec. 31, 2010		Jan. 01, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	$ 12.2		$ 12.1
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	3.6		2.6
Bond Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	1.0		2.1
Value Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	3.2		2.0
Growth Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	4.4		5.4
Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0.5
United Kingdom Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	16.5
United States Companies [Membeer]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	5.0
Other International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	8.8
United Kingdom Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	5.1
United Kingdom Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	3.4
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	12.2		12.1
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	3.6		2.6
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	1.0		2.1
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	3.2		2.0
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	4.4		5.4
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0.5
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	16.5
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	5.0
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	8.8
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	5.1
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	3.4
Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0		0
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] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
Significant Observable Inputs (Level 2) [Member] | United Kingdom Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
Significant Observable Inputs (Level 2) [Member] | United States Companies [Membeer]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
Significant Observable Inputs (Level 2) [Member] | Other International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
Significant Observable Inputs (Level 2) [Member] | United Kingdom Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
Significant Observable Inputs (Level 2) [Member] | United Kingdom Corporate Bonds [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] | 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] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | United Kingdom Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | United States Companies [Membeer]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | Other International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | United Kingdom Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	0
Significant Unobservable Inputs (Level 3) [Member] | United Kingdom Corporate Bonds [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	12.2	[1]	12.1	[1]	11.7	[1]
UNITED KINGDOM [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	39.3		40.4
UNITED KINGDOM [Member] | Cash [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			0.4
UNITED KINGDOM [Member] | United Kingdom Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			8.9
UNITED KINGDOM [Member] | United States Companies [Membeer]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			5.6
UNITED KINGDOM [Member] | Other International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			19.0
UNITED KINGDOM [Member] | United Kingdom Government Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			4.6
UNITED KINGDOM [Member] | United Kingdom Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets			1.9
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	39.3		40.4
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			0.4
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			8.9
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			5.6
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			19.0
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			4.6
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			1.9
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
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
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
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
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
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
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
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
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
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
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
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
UNITED KINGDOM [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of plan assets	$ 39.3	[1]	$ 40.4	[1]	$ 35.6	[1]

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