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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, 2019
Summary of unaudited consolidated pro forma results of operations |  |
Revenues | $ 6,036.2 | $ 11,880.9
Income from continuing operations | 122.5 | 226.6
Net income | $ 122.6 | $ 226.8
Income from continuing operations per diluted common share (in dollars per share) | $ 1.48 | $ 2.71
Net income per diluted common share (in dollars per share) | $ 1.48 | $ 2.71

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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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