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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Summary of unaudited consolidated pro forma results of operations |  |  |  |
Revenues | $ 6,013.7 | $ 5,996.3 | $ 17,888.9 | $ 18,384.2
Income from continuing operations | 115.5 | 117.9 | 319.7 | 338.0
Net income | $ 115.7 | $ 118.0 | $ 320.4 | $ 338.0
Income from continuing operations per diluted common share (in dollars per share) | $ 1.41 | $ 1.39 | $ 3.86 | $ 3.96
Net income per diluted common share (in dollars per share) | $ 1.42 | $ 1.39 | $ 3.86 | $ 3.96

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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