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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]      
Income tax benefit $ (148.9) $ (76.5) $ 31.6
Returns and Allowances      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 51.8 64.4 106.7
Charged to Costs and Expenses [1] 149.3 136.8 162.3
Charged to Other Accounts 24.3 [2] 0.0 0.0
Deductions [3] (156.8) (149.4) (204.6)
Balance at End of Period 68.6 51.8 64.4
Provision for Doubtful Accounts      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 6.0 4.1 4.9
Charged to Costs and Expenses [1] (0.2) 1.9 (0.5)
Charged to Other Accounts 3.2 [2] 0.0 0.0
Deductions 0.0 0.0 (0.3) [3]
Balance at End of Period 9.0 6.0 4.1
Deferred Tax Valuation Allowance      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Period 10.1 9.3 8.9
Charged to Costs and Expenses [1] 0.4 0.0 0.0
Charged to Other Accounts 1.4 [2] 0.8 0.4
Deductions (6.0) [4] 0.0 0.0
Balance at End of Period 5.9 $ 10.1 $ 9.3
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] 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.