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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Summary of unaudited consolidated pro forma results of operations |  |  |  |
Revenues | $ 7,023.4 | $ 3,772.9 | $ 12,866.9 | $ 8,841.3
Income from continuing operations | 340.2 | 48.8 | 524.1 | 101.4
Net income | $ 340.3 | $ 48.9 | $ 524.2 | $ 101.5
Income from continuing operations per diluted common share (in dollars per share) | $ 4.21 | $ 0.61 | $ 6.50 | $ 1.26
Net income per diluted common share (in dollars per share) | $ 4.21 | $ 0.61 | $ 6.50 | $ 1.26

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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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