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Other Intangible Assets - Summary of Other Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract] |  |  |  |  |
Gross cost at January 1 |  |  | $ 175.5 | $ 106.2 |
Capitalization of internally developed software and other costs |  |  | 3.0 | 3.8 |
Exchange effect |  |  | 0.1 | 0 |
Gross cost at June 30 | 178.6 | 110.0 | 178.6 | 110.0 |
Accumulated amortization at January 1 |  |  | (48.7) | (37.6) |
Amortization expense | (4.4) | (2.1) | (8.8) | (4.2) |
Exchange effect |  |  | 0 | (0.1) |
Accumulated amortization at June 30 | (57.5) | (41.9) | (57.5) | (41.9) |
Net book amount at June 30 | $ 121.1 | $ 68.1 | $ 121.1 | $ 68.1 | $ 126.8

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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