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Employee Benefit Plans - Composition of Pension Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	$ 371.5	$ 372.0	$ 414.8
United States Pension Plans of US Entity, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	13.6	13.9	$ 15.5
Defined Benefit Pension Plans
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	385.2	385.9
Defined Benefit Pension Plans | Other Defined Benefit Pension Plans
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	11.7	11.2
Level 1 | Defined Benefit Pension Plans
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	141.0	135.8
Level 1 | Defined Benefit Pension Plans | Other Defined Benefit Pension Plans
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	3.5	3.5
Level 2 | Defined Benefit Pension Plans
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	13.7	13.9
Level 3 | Defined Benefit Pension Plans
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	230.5	236.2
Level 3 | Defined Benefit Pension Plans | Other Defined Benefit Pension Plans
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	8.2	7.7
Germany | Defined Benefit Pension Plans | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	217.0	223.1
Germany | Level 3 | Defined Benefit Pension Plans | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	217.0	223.1
Canada | Defined Benefit Pension Plans | Local Currency Equities Member | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	14.8	9.6
Canada | Defined Benefit Pension Plans | Non Local Currency Equities | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	19.7	23.3
Canada | Defined Benefit Pension Plans | Local Currency Fixed Income | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	59.5	50.6
Canada | Defined Benefit Pension Plans | Global Mutual Fund | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets		6.8
Canada | Defined Benefit Pension Plans | Cash And Other | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	0.4	0.5
Canada | Level 1 | Defined Benefit Pension Plans | Local Currency Equities Member | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	14.8	9.6
Canada | Level 1 | Defined Benefit Pension Plans | Non Local Currency Equities | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	19.7	23.3
Canada | Level 1 | Defined Benefit Pension Plans | Local Currency Fixed Income | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	59.5	50.6
Canada | Level 1 | Defined Benefit Pension Plans | Global Mutual Fund | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets		6.8
Canada | Level 1 | Defined Benefit Pension Plans | Cash And Other | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	0.4	0.5
Norway | Defined Benefit Pension Plans | Local Currency Equities Member | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	1.6	2.0
Norway | Defined Benefit Pension Plans | Non Local Currency Equities | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	4.1	3.6
Norway | Defined Benefit Pension Plans | Local Currency Fixed Income | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	23.2	24.5
Norway | Defined Benefit Pension Plans | Cash And Other | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	9.9	7.9
Norway | Defined Benefit Pension Plans | Non Local Currency Fixed Income | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	5.4	4.7
Norway | Defined Benefit Pension Plans | Real Estate | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	4.2	4.2
Norway | Level 1 | Defined Benefit Pension Plans | Local Currency Equities Member | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	1.6	2.0
Norway | Level 1 | Defined Benefit Pension Plans | Non Local Currency Equities | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	4.1	3.6
Norway | Level 1 | Defined Benefit Pension Plans | Local Currency Fixed Income | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	23.2	24.5
Norway | Level 1 | Defined Benefit Pension Plans | Cash And Other | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	8.8	6.7
Norway | Level 1 | Defined Benefit Pension Plans | Non Local Currency Fixed Income | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	5.4	4.7
Norway | Level 3 | Defined Benefit Pension Plans | Cash And Other | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	1.1	1.2
Norway | Level 3 | Defined Benefit Pension Plans | Real Estate | Foreign Pension Plans, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	4.2	4.2
United States | Defined Benefit Pension Plans | CMRT | United States Pension Plans of US Entity, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	13.7	13.9
United States | Level 2 | Defined Benefit Pension Plans | CMRT | United States Pension Plans of US Entity, Defined Benefit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Pension plan assets	$ 13.7	$ 13.9

X

- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ 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=64937038&loc=d3e12355-114930

Reference 2: 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=65897934&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6749337

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Assets
-URI http://asc.fasb.org/extlink&oid=6520858

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