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Business Combinations - Schedule of Unaudited Pro Forma Financial Results (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Business Combinations [Abstract] |  |
Revenue | $ 2,644.9 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 2,353.5 us-gaap_BusinessAcquisitionsProFormaRevenue
Net income (controlling interest) | $ 474.9 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | $ 382.3 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Earnings per share—basic (in dollars per share) | $ 8.63 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic | $ 7.20 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Earnings per share—diluted (in dollars per share) | $ 8.40 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 6.94 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted

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- Definition The pro forma basic 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 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 net Income or Loss 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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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the 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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