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Acquisitions and Other Investments - Actual and Pro Forma Financial Results (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pro forma financial results |  |  |
Revenues | $ 5,434.9 | $ 5,552.2 | $ 5,036.6
Net income (loss) | 64.9 | $ 101.9 | $ (38.0)
Greektown Casino-Hotel |  |  |
Actual financial results of acquiree since acquisition date |  |  |
Revenues | 195.9 |  |
Net income | 10.9 |  |
Margaritaville Resort Casino |  |  |
Actual financial results of acquiree since acquisition date |  |  |
Revenues | 157.6 |  |
Net income | $ 13.7 |  |

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- Definition The pro forma net Income or Loss for the 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/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 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)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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