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Investments Equity Interests Income (Loss) (Details) - USD ($)
$ in Millions
1 Months Ended 11 Months Ended 12 Months Ended
May 11, 2017
Mar. 15, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]          
Equity interests income (loss)     $ (42.9) $ (52.8) $ 10.7
EPIX          
Schedule of Equity Method Investments [Line Items]          
Equity interests income (loss) $ 4.0   0.0 [1] 4.0 [1] 31.0 [1]
Pop          
Schedule of Equity Method Investments [Line Items]          
Equity interests income (loss)   $ (8.4) (8.4) [2] (9.0) [2] (6.9) [2]
Other Equity Method Investments          
Schedule of Equity Method Investments [Line Items]          
Equity interests income (loss)     $ (34.5) $ (47.8) $ (13.4)
[1] The Company's equity interest in EPIX was sold in May 2017 (see further discussion under "Gain (Loss) on Investments" section below).
[2] The Company's equity interest in Pop was sold in March 2019 (see further discussion under "Pop" section below).