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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.

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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