v3.10.0.1
INVESTMENTS - Sum. Finan. Info and Earnings (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 18, 2018
Mar. 31, 2018
Mar. 15, 2018
Dec. 31, 2017
Jun. 30, 2017
Operating Results:                  
Revenues $ 43.4 $ 156.3 $ 320.9 $ 417.9          
Operating costs and expenses 19.1 99.3 230.8 303.6          
Net earnings (loss) 24.3 57.0 90.1 114.3          
Recorded equity in earnings 70.0 (1.8) 74.0 (199.1)          
Price per share (in dollars per share)           $ 5.19      
NCM                  
Financial Condition:                  
The company's recorded investment               $ 161.1  
Operating Results:                  
Recorded equity in earnings 28.9 (11.1) 17.3 (216.8)          
Impairment of investment     16.0 204.5          
Price per share (in dollars per share)         $ 7.30 $ 5.19 $ 5.64   $ 7.42
DCIP                  
Operating Results:                  
Recorded equity in earnings 7.4 6.0 20.9 21.2          
Other                  
Operating Results:                  
Recorded equity in earnings $ 3.6 $ 2.3 $ 5.3 $ (4.3)