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Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2013
Goodwill/Other Intangible Assets [Abstract] |
Summary of Other Intangible Assets |
|  | Three Months Ended March 31 |
(in millions) |  | 2013 |  |  | 2012 |
Gross cost at January 1 |  | $ | 106.2 |  |  | $ | 51.2 |
Capitalization of internally developed software and other costs |  |  | 2.1 |  |  |  | 2.5 |
Exchange effect |  |  | 0.0 |  |  |  | 0.0 |
Gross cost at March 31 |  |  | 108.3 |  |  |  | 53.7 |
Accumulated amortization at January 1 |  |  | (37.6 | ) |  |  | (33.5 | )
Amortization expense |  |  | (2.1 | ) |  |  | (1.0 | )
Exchange effect |  |  | (0.1 | ) |  |  | 0.0 |
Accumulated amortization at March 31 |  |  | (39.8 | ) |  |  | (34.5 | )
Net book amount at March 31 |  | $ | 68.5 |  |  | $ | 19.2 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
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