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Intangible Assets, net (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 2011 acquisitions | Dec. 31, 2011 Covenants not to compete | Dec. 31, 2010 Covenants not to compete | Dec. 31, 2011 Loan fees | Dec. 31, 2010 Loan fees | Jul. 26, 2011 Loan fees Unsecured revolving credit facility | Dec. 31, 2011 Customer lists/relationships | Dec. 31, 2010 Customer lists/relationships | Dec. 31, 2011 Software - internal use | Dec. 31, 2010 Software - internal use | Dec. 31, 2011 Other | Dec. 31, 2010 Other | Dec. 31, 2011 Trade names | Dec. 31, 2010 Trade names
Intangible assets subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets subject to amortization, Gross Carrying Amount | $ 530.9 | $ 423.3 |  |  | $ 7.3 | $ 7.1 | $ 31.2 | $ 23.9 | $ 7.3 | $ 477.7 | $ 379.3 | $ 8.1 | $ 8.1 | $ 6.6 | $ 4.9 |  |
Intangible assets subject to amortization, Accumulated Amortization | (145.6) | (110.0) |  |  | (6.9) | (6.7) | (17.6) | (14.1) |  | (114.2) | (83.7) | (4.7) | (3.8) | (2.2) | (1.7) |  |
Intangible assets not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets not subject to amortization, Gross Carrying Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 510.6 | 442.5
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets, Gross Carrying Amount | 1,041.5 | 865.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, excluding goodwill |  |  |  | 174.3 |  |  |  |  |  |  |  |  |  |  |  |  |
Changes in intangible assets due to foreign currency translation losses | 5.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense for intangible assets | 35.8 | 29.6 | 29.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of estimated aggregate amortization expense for each of the next five years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 | 40.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2013 | 40.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 38.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 36.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | $ 35.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -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 Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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