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Equity Method Investments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Equity interest in the net income of equity method investments |  | $ 17.2 | $ 33.5 | $ 30.8
Equity interest in the net assets of equity method investments |  | 68.4 | 169.1 |
Remeasurement gain, equity interest in Clemenger Group | 123.4 | 123.4 | 0 | 0
Remeasurement gain, acquisition of controlling interests in affiliates |  | $ 15.1 | $ 26.0 | $ 41.3
Clemenger Group [Member] |  |  |  |
Acquisition of controlling interests in affiliates, ownership percentage after acquisition |  | 73.70% |  |
Acquisition of controlling interests in affiliates, ownership percentage before acquisition |  | 46.70% |  |
Affiliate in India [Member] |  |  |  |
Acquisition of controlling interests in affiliates, ownership percentage after acquisition |  | 100.00% |  |
Affiliate in Turkey [Member] |  |  |  |
Acquisition of controlling interests in affiliates, ownership percentage after acquisition |  | 76.00% |  |
Affiliate in Middle East [Member] |  |  |  |
Acquisition of controlling interests in affiliates, ownership percentage after acquisition |  |  | 68.60% |
Affiliate in South America [Member] |  |  |  |
Acquisition of controlling interests in affiliates, ownership percentage after acquisition |  |  | 100.00% |
Affiliate in Middle East [Member] |  |  |  |
Acquisition of controlling interests in affiliates, ownership percentage after acquisition |  |  |  | 85.00%

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- Definition In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Number 141R -Paragraph 68 -Name Statement of Financial Accounting Standard (FAS) -Subparagraph q(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 48 -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 Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463 + Details
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