Retirement Benefit Plans - Fair Value of Foreign Pension Plan Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	$ 68.6	$ 68.2
Foreign-based Defined Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	385.4	372.3	231.6
Foreign-based Defined Benefit Plans [Member] | Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	132.2	114.4
Foreign-based Defined Benefit Plans [Member] | Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	184.6	189.7
Foreign-based Defined Benefit Plans [Member] | Fair Value Measurements at Reporting Date Using: Significant Unobservable Inputs (Level 3) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	68.6	68.2
Foreign-based Defined Benefit Plans [Member] | Cash and Cash Equivalents [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	31.0	13.9
Foreign-based Defined Benefit Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	31.0	13.9
Foreign-based Defined Benefit Plans [Member] | Energy [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	4.7	4.7
Foreign-based Defined Benefit Plans [Member] | Energy [Member] | Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	4.7	4.7
Foreign-based Defined Benefit Plans [Member] | Materials [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	7.1	5.7
Foreign-based Defined Benefit Plans [Member] | Materials [Member] | Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	7.1	5.7
Foreign-based Defined Benefit Plans [Member] | Industrials [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	7.5	7.6
Foreign-based Defined Benefit Plans [Member] | Industrials [Member] | Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	7.5	7.6
Foreign-based Defined Benefit Plans [Member] | Consumer Discretionary [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	6.5	5.2
Foreign-based Defined Benefit Plans [Member] | Consumer Discretionary [Member] | Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	6.5	5.2
Foreign-based Defined Benefit Plans [Member] | Consumer Staples [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	7.5	6.8
Foreign-based Defined Benefit Plans [Member] | Consumer Staples [Member] | Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	7.5	6.8
Foreign-based Defined Benefit Plans [Member] | Health Care [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	6.8	9.7
Foreign-based Defined Benefit Plans [Member] | Health Care [Member] | Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	6.8	9.7
Foreign-based Defined Benefit Plans [Member] | Financials [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	16.3	15.8
Foreign-based Defined Benefit Plans [Member] | Financials [Member] | Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	16.3	15.8
Foreign-based Defined Benefit Plans [Member] | Information Technology [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	4.9	5.8
Foreign-based Defined Benefit Plans [Member] | Information Technology [Member] | Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	4.9	5.8
Foreign-based Defined Benefit Plans [Member] | Telecommunication Services [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	2.0	2.6
Foreign-based Defined Benefit Plans [Member] | Telecommunication Services [Member] | Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	2.0	2.6
Foreign-based Defined Benefit Plans [Member] | Utilities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	3.4	3.4
Foreign-based Defined Benefit Plans [Member] | Utilities [Member] | Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	3.4	3.4
Foreign-based Defined Benefit Plans [Member] | Other [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	36.7	35.7
Foreign-based Defined Benefit Plans [Member] | Other [Member] | Fair Value Measurements at Reporting Date Using: Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	34.5	33.2
Foreign-based Defined Benefit Plans [Member] | Other [Member] | Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	2.2	2.5
Foreign-based Defined Benefit Plans [Member] | Government Bonds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	72.5	64.4
Foreign-based Defined Benefit Plans [Member] | Government Bonds [Member] | Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	72.5	64.4
Foreign-based Defined Benefit Plans [Member] | Corporate Bonds [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	58.9	65.9
Foreign-based Defined Benefit Plans [Member] | Corporate Bonds [Member] | Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	58.9	65.9
Foreign-based Defined Benefit Plans [Member] | Asset-backed Securities [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	22.0	24.0
Foreign-based Defined Benefit Plans [Member] | Asset-backed Securities [Member] | Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	22.0	24.0
Foreign-based Defined Benefit Plans [Member] | Other Debt [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	1.7	2.8
Foreign-based Defined Benefit Plans [Member] | Other Debt [Member] | Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	1.7	2.8
Foreign-based Defined Benefit Plans [Member] | Mortgage Loans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	9.2	9.0
Foreign-based Defined Benefit Plans [Member] | Mortgage Loans [Member] | Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	9.2	9.0
Foreign-based Defined Benefit Plans [Member] | Insurance Contracts [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	6.1	6.4
Foreign-based Defined Benefit Plans [Member] | Insurance Contracts [Member] | Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	6.1	6.4
Foreign-based Defined Benefit Plans [Member] | Other Investments [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	12.0	14.7
Foreign-based Defined Benefit Plans [Member] | Other Investments [Member] | Fair Value Measurements at Reporting Date Using: Significant Other Observable Inputs (Level 2) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	12.0	14.7
Foreign-based Defined Benefit Plans [Member] | Real Estate [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	68.6	68.2
Foreign-based Defined Benefit Plans [Member] | Real Estate [Member] | Fair Value Measurements at Reporting Date Using: Significant Unobservable Inputs (Level 3) [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value	$ 68.6	$ 68.2