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Segment Information - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 5,320.9 | $ 3,828.7
Operating segments | U.S. Media |  |
Segment Reporting Information [Line Items] |  |
Total assets | 5,011.8 | 3,610.0
Operating segments | Other |  |
Segment Reporting Information [Line Items] |  |
Total assets | 294.8 | 202.5
Corporate |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 14.3 | $ 16.2

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