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Segment Information - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Revenues $ 401.3 $ 392.4 $ 396.2 $ 330.6 $ 397.4 $ 382.8 $ 385.3 $ 348.4 $ 1,520.5 $ 1,513.9 $ 1,513.8
U.S. Media                      
Segment Reporting Information [Line Items]                      
Revenues 369.3 363.0 367.1 307.1 368.0 356.7 356.5 312.6 1,406.5 1,393.8  
Other                      
Segment Reporting Information [Line Items]                      
Revenues $ 32.0 [1] $ 29.4 [1] $ 29.1 [1] $ 23.5 $ 29.4 [2] $ 26.1 [2] $ 28.8 [2] $ 35.8 114.0 120.1  
Operating segments | U.S. Media                      
Segment Reporting Information [Line Items]                      
Revenues                 1,406.5 1,393.8 1,344.3
Operating segments | Other                      
Segment Reporting Information [Line Items]                      
Revenues                 $ 114.0 $ 120.1 $ 169.5
[1] On June 13, 2017, we completed the Transaction. (See Note 9. Equity and Note 11. Acquisitions and Dispositions: Acquisitions to the Consolidated Financial Statements.)
[2] On April 1, 2016, we completed the Disposition. (See Note 11. Acquisitions and Dispositions: Dispositions to the Consolidated Financial Statements.)