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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]      
Income tax benefit $ (319.4) $ (148.9) $ (76.5)
Returns and Allowances      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 68.6 51.8 64.4
Charged to Costs and Expenses [1] 168.3 149.3 136.8
Charged to Other Accounts 0.0 24.3 [2] 0.0
Deductions [3] (180.7) (156.8) (149.4)
Balance at End of Period 56.2 68.6 51.8
Provision for Doubtful Accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 9.0 6.0 4.1
Charged to Costs and Expenses [1] (1.0) (0.2) 1.9
Charged to Other Accounts 0.0 3.2 [2] 0.0
Deductions (0.5) [4] 0.0 0.0
Balance at End of Period 7.5 9.0 6.0
Deferred Tax Valuation Allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 5.9 10.1 9.3
Charged to Costs and Expenses [1] 67.3 0.4 0.0
Charged to Other Accounts 0.0 1.4 [2] 0.8
Deductions 0.0 (6.0) [5] 0.0
Balance at End of Period $ 73.2 5.9 $ 10.1
Income tax benefit   (1.4)  
Other comprehensive income   $ 4.6  
[1] Charges for returns and allowances are charges against revenue.
[2] Opening balances due to the acquisition of Starz on December 8, 2016.
[3] Actual returns and fluctuations in foreign currency exchange rates.
[4] Uncollectible accounts written off and fluctuations in foreign currency exchange rates.
[5] Valuation allowance reversal, of which $1.4 million was recorded as a tax benefit in the consolidated statement of income, and $4.6 million was recorded in other comprehensive income. The $4.6 million relates to the gain on Starz investment.