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Business Combinations - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Summary of unaudited consolidated pro forma results of operations |  |  |  |
Revenues | $ 5,383.4 | $ 5,693.4 | $ 10,595.7 | $ 11,000.0
Income from continuing operations | 106.0 | 101.5 | 191.2 | 188.1
Net income | $ 106.2 | $ 100.3 | $ 190.8 | $ 186.9
Income from continuing operations per diluted common share (in dollars per share) | $ 1.23 | $ 1.19 | $ 2.23 | $ 2.17
Net income per diluted common share (in dollars per share) | $ 1.23 | $ 1.18 | $ 2.22 | $ 2.15

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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=65885119&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=65885119&loc=d3e1392-128463 + Details
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