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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.

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