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Goodwill (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2013
Goodwill. |
Schedule of changes in the carrying amount of goodwill |
|  | (in millions) |
--- | --- | --- | ---
Balance at December 31, 2010 |  | $ | 1,109.6 |
Acquisition |  |  | 138.5 |
Purchase price allocation adjustments |  |  | 0.2 |
Effect of foreign currency translation |  |  | (4.0 | )
​ | ​ | ​ | ​ | ​
Balance at December 31, 2011 |  |  | 1,244.3 |
Acquisitions |  |  | 68.0 |
Effect of foreign currency translation |  |  | 2.3 |
​ | ​ | ​ | ​ | ​
Balance at December 31, 2012 |  |  | 1,314.6 |
Acquisitions |  |  | 382.4 |
Effect of foreign currency translation |  |  | (5.4 | )
​ | ​ | ​ | ​ | ​
Balance at December 31, 2013 |  | $ | 1,691.6 |
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 + Details
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