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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Summary of unaudited consolidated pro forma results of operations |  |  |  |
Revenues | $ 5,658.6 | $ 5,621.8 | $ 17,365.7 | $ 16,432.4
Income from continuing operations | 130.1 | 95.4 | 372.7 | 288.9
Net income | $ 130.2 | $ 95.5 | $ 373.0 | $ 288.6
Income from continuing operations per diluted common share (in dollars per share) | $ 1.53 | $ 1.11 | $ 4.37 | $ 3.36
Net income per diluted common share (in dollars per share) | $ 1.53 | $ 1.11 | $ 4.37 | $ 3.36

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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=79982066&loc=d3e1392-128463 + Details
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- Definition Amount after tax of pro forma income from continuing operations as if the business combination 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=79982066&loc=d3e1392-128463 + Details
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