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Business Combinations (Details 3) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Summary of unaudited consolidated pro forma results of operations |  |
Revenues | $ 17,964.5 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 16,687.5 us-gaap_BusinessAcquisitionsProFormaRevenue
Income from continuing operations | 311.1 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax | 286.2 us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
Net income | $ 292.4 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | $ 281.6 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Income from continuing operations per diluted common share (in dollars per share) | $ 3.44 us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted | $ 3.17 us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted
Net income per diluted common share (in dollars per share) | $ 3.23 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 3.12 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted

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- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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