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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Summary of unaudited consolidated pro forma results of operations |  |  |  |
Revenues | $ 5,755.8 | $ 6,003.1 | $ 11,321.5 | $ 11,833.1
Income from continuing operations | 117.7 | 134.6 | 217.6 | 243.0
Net income | $ 117.8 | $ 134.7 | $ 217.8 | $ 243.2
Income from continuing operations per diluted common share (in dollars per share) | $ 1.42 | $ 1.58 | $ 2.60 | $ 2.84
Net income per diluted common share (in dollars per share) | $ 1.42 | $ 1.59 | $ 2.60 | $ 2.84

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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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