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Employee benefit plans - Composition of Pension Plan Assets (Detail) (Defined Benefit Pension Plans [Member], USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | $ 460.6 | $ 389.1 |
Other Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 19.5 | 16.9 |
Germany [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 224.8 | 187.2 |
Canada [Member] | Local currency equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 22.4 | 18.1 |
Canada [Member] | Foreign equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 30.3 | 28.0 |
Canada [Member] | Local currency fixed income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 38.0 | 33.8 |
Canada [Member] | Cash and other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 2.1 | 2.4 |
Canada [Member] | Global Mutual Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 5.6 |  |
Norway [Member] | Local currency equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 3.2 | 2.0 |
Norway [Member] | Foreign equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 5.2 | 3.7 |
Norway [Member] | Local currency fixed income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 40.9 | 35.9 |
Norway [Member] | Cash and other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 7.6 | 6.3 |
Norway [Member] | Foreign fixed income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 4.8 | 4.3 |
Norway [Member] | Real estate [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 5.5 | 5.1 |
United States [Member] | CMRT [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 50.7 | 45.4 |
Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 171.8 | 143.2 |
Level 1 [Member] | Other Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 12.3 | 10.0 |
Level 1 [Member] | Canada [Member] | Local currency equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 22.4 | 18.1 |
Level 1 [Member] | Canada [Member] | Foreign equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 30.3 | 28.0 |
Level 1 [Member] | Canada [Member] | Local currency fixed income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 38.0 | 33.8 |
Level 1 [Member] | Canada [Member] | Cash and other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 2.1 | 2.4 |
Level 1 [Member] | Canada [Member] | Global Mutual Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 5.6 |  |
Level 1 [Member] | Norway [Member] | Local currency equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 3.2 | 2.0 |
Level 1 [Member] | Norway [Member] | Foreign equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 5.2 | 3.7 |
Level 1 [Member] | Norway [Member] | Local currency fixed income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 40.9 | 35.9 |
Level 1 [Member] | Norway [Member] | Cash and other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 7.0 | 4.9 |
Level 1 [Member] | Norway [Member] | Foreign fixed income [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 4.8 | 4.3 |
Level 1 [Member] | United States [Member] | CMRT [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets |  | 0.1 |
Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 50.7 | 45.3 |
Level 2 [Member] | United States [Member] | CMRT [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 50.7 | 45.3 |
Level 3 Inputs [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 238.1 | 200.6 | 214.9
Level 3 Inputs [Member] | Other Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 7.2 | 6.9 |
Level 3 Inputs [Member] | Germany [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 224.8 | 187.2 |
Level 3 Inputs [Member] | Norway [Member] | Cash and other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | 0.6 | 1.4 |
Level 3 Inputs [Member] | Norway [Member] | Real estate [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension plan assets | $ 5.5 | $ 5.1 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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