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Investments (Gain (Loss) on Investments) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
May 11, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]              
Impairments of investments [1]   $ (2.6) $ (29.2) $ (36.8) $ (29.2)    
Unrealized losses on equity securities held at reporting date   (3.6) 0.0 (6.4) 0.0    
Gain on sale of EPIX [2]   0.0 0.0 0.0 201.0    
Gain (loss) on investments   (6.2) $ (29.2) (43.2) 171.8    
Equity securities without readily determinable fair value, impairments       34.2      
Equity securities without readily determinable fair value, amount   $ 0.5   $ 0.5   $ 0.0 $ 30.6
Disposal Group, Disposed of by Sale, Not Discontinued Operations | EPIX              
Schedule of Equity Method Investments [Line Items]              
Ownership interest sold 31.15%            
Gain on sale of EPIX         $ 201.0    
[1] In the three and nine months ended December 31, 2018 and 2017, amounts represent impairments of equity method investments, and the nine months ended December 31, 2018 also includes other-than-temporary impairments of $34.2 million on investments in equity securities without readily determinable fair values and notes receivable (previously included in other assets) which were written down to their estimated fair value of zero.
[2] In May 2017, the Company sold all of its 31.15% equity interest in EPIX, and recorded a gain before income taxes of approximately $201.0 million. Prior to the sale of its interest in EPIX, the Company had accounted for such interest as an equity method investment.