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Goodwill (Goodwill) (Details)
$ in Millions
 3 Months Ended
Jun. 30, 2018
USD ($)
Goodwill [Roll Forward]  
Balance as of March 31, 2018 $ 2,740.8
Business acquisitions 92.0 [1]
Other 0.0 [2]
Balance as of June 30, 2018 2,832.8
Motion Pictures  
Goodwill [Roll Forward]  
Balance as of March 31, 2018 393.7
Business acquisitions 0.0 [1]
Other 0.0 [2]
Balance as of June 30, 2018 393.7
Television Production  
Goodwill [Roll Forward]  
Balance as of March 31, 2018 240.4
Business acquisitions 92.0 [1]
Other 68.8 [2]
Balance as of June 30, 2018 401.2
Media Networks  
Goodwill [Roll Forward]  
Balance as of March 31, 2018 2,106.7
Business acquisitions 0.0 [1]
Other (68.8) [2]
Balance as of June 30, 2018 $ 2,037.9
[1] Represents goodwill resulting from the acquisition of 3 Arts Entertainment (see Note 2).
[2] Represents the reallocation of goodwill as a result of the reorganization of our segment structure (see Note 15).