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Supplemental Financial Information (Tables) | 12 Months Ended
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Mar. 31, 2018
Supplemental Cash Flow Information [Abstract] |
Schedule of Valuation and Qualifying Accounts Disclosure Deferred Tax Assets | A summary of additions and deductions related to the valuation allowance for deferred tax asset accounts for the years ended March 31, 2018, 2017 and 2016 follows (amounts in millions):
| Balance at Beginning of Year |  | Additions Charged to Costs and Expenses |  | Additions Charged to Other Accounts |  | Deductions |  | Balance at End of Year
Valuation allowance for deferred tax assets: |  |  |  |  |  |  |  |  |
Fiscal 2018 | $ | 210.1 |  |  | $ | 36.2 |  |  | $ | — |  |  | $ | (41.8 | ) |  | $ | 204.5 |
Fiscal 2017 | 161.8 |  |  | 15.2 |  |  | 37.6 |  |  | (4.5 | ) |  | 210.1 |
Fiscal 2016 | 116.5 |  |  | 5.5 |  |  | 47.8 |  |  | (8.0 | ) |  | 161.8 |
Schedule of Valuation and Qualifying Accounts Disclosure Allowance for Doubtful Accounts | A summary of additions and deductions related to the allowance for doubtful accounts for the years ended March 31, 2018, 2017 and 2016 follows (amounts in millions):
| Balance at Beginning of Year |  | Additions Charged to Costs and Expenses |  | Deductions (1) |  | Balance at End of Year
Allowance for doubtful accounts: |  |  |  |  |  |  |
Fiscal 2018 | $ | 2.1 |  |  | $ | 0.2 |  |  | $ | (0.1 | ) |  | $ | 2.2 |
Fiscal 2017 | $ | 2.5 |  |  | $ | 0.2 |  |  | $ | (0.6 | ) |  | $ | 2.1 |
Fiscal 2016 | $ | 2.6 |  |  | $ | 0.1 |  |  | $ | (0.2 | ) |  | $ | 2.5 |
(1) Deductions represent uncollectible accounts written off, net of recoveries.
Schedule of Accumulated Other Comprehensive Income (Loss) | The following tables present the changes in the components of accumulated other comprehensive income (AOCI) for the years ended March 31, 2018 and March 31, 2017:
| Unrealized Holding Gains (Losses) Available-for-sale Securities |  | Minimum Pension Liability |  | Foreign Currency |  | Total
Balance at March 31, 2017 | $ | 0.3 |  |  | $ | (5.3 | ) |  | $ | (9.4 | ) |  | $ | (14.4 | )
Other comprehensive loss before reclassifications | (13.6 | ) |  | (5.6 | ) |  | — |  |  | (19.2 | )
Amounts reclassified from accumulated other comprehensive income (loss) | 15.2 |  |  | 0.8 |  |  | — |  |  | 16.0 |
Net other comprehensive income (loss) | 1.6 |  |  | (4.8 | ) |  | — |  |  | (3.2 | )
Balance at March 31, 2018 | $ | 1.9 |  |  | $ | (10.1 | ) |  | $ | (9.4 | ) |  | $ | (17.6 | )
| Unrealized Holding Gains (Losses) Available-for-sale Securities |  | Minimum Pension Liability |  | Foreign Currency |  | Total
Balance at March 31, 2016 | $ | 0.3 |  |  | $ | — |  |  | $ | (3.7 | ) |  | $ | (3.4 | )
Other comprehensive loss before reclassifications | (1.5 | ) |  | (5.3 | ) |  | (5.7 | ) |  | (12.5 | )
Amounts reclassified from accumulated other comprehensive income (loss) | 1.5 |  |  | — |  |  | — |  |  | 1.5 |
Net other comprehensive loss | — |  |  | (5.3 | ) |  | (5.7 | ) |  | (11.0 | )
Balance at March 31, 2017 | $ | 0.3 |  |  | $ | (5.3 | ) |  | $ | (9.4 | ) |  | $ | (14.4 | )
Reclassification out of Accumulated Other Comprehensive Income | The table below details where reclassifications of realized transactions out of AOCI are recorded on the consolidated statements of income (amounts in millions).
| Year ended March 31, |  |
Description of AOCI Component | 2018 |  | 2017 |  | 2016 |  | Related Statement of Income Line
Unrealized (losses) gains on available-for-sale securities | $ | (15.5 | ) |  | $ | (1.5 | ) |  | $ | 10.9 |  |  | Other income, net
Amortization of actuarial loss | (0.8 | ) |  | — |  |  | — |  |  | Other income, net
Taxes | 0.3 |  |  | — |  |  | — |  |  | Provision for income taxes
Reclassification of realized transactions, net of taxes | $ | (16.0 | ) |  | $ | (1.5 | ) |  | $ | 10.9 |  |  | Net Income

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