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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Mar. 31, 2020
Equity [Abstract] |
Schedule of Changes in Components of Accumulated Other Comprehensive Income | The following tables present the changes in the components of accumulated other comprehensive loss for the years ended March 31, 2020 and March 31, 2019:
| Unrealized Holding Gains (Losses) Available-for-sale Securities |  | Minimum Pension Liability |  | Foreign Currency |  | Total
Balance at March 31, 2019 | $ | 0.2 |  |  | $ | (6.2 | ) |  | $ | (14.7 | ) |  | $ | (20.7 | )
Impact of change in accounting principle | (0.2 | ) |  | (1.1 | ) |  | — |  |  | (1.3 | )
Opening Balance as of April 1, 2019 | $ | — |  |  | $ | (7.3 | ) |  | $ | (14.7 | ) |  | $ | (22.0 | )
Other comprehensive income (loss) before reclassifications | — |  |  | 1.4 |  |  | (1.8 | ) |  | (0.4 | )
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 0.8 |  |  | — |  |  | 0.8 |
Net other comprehensive income (loss) | — |  |  | 2.2 |  |  | (1.8 | ) |  | 0.4 |
Balance at March 31, 2020 | $ | — |  |  | $ | (5.1 | ) |  | $ | (16.5 | ) |  | $ | (21.6 | )
| Unrealized Holding Gains (Losses) Available-for-sale Securities |  | Minimum Pension Liability |  | Foreign Currency |  | Total
Balance at March 31, 2018 | $ | 1.9 |  |  | $ | (10.1 | ) |  | $ | (9.4 | ) |  | $ | (17.6 | )
Impact of change in accounting principle | (1.7 | ) |  | — |  |  | — |  |  | (1.7 | )
Opening Balance as of April 1, 2018 | $ | 0.2 |  |  | $ | (10.1 | ) |  | $ | (9.4 | ) |  | $ | (19.3 | )
Other comprehensive (loss) income before reclassifications | (5.6 | ) |  | 2.9 |  |  | (5.3 | ) |  | (8.0 | )
Amounts reclassified from accumulated other comprehensive income | 5.6 |  |  | 1.0 |  |  | — |  |  | 6.6 |
Net other comprehensive income (loss) | — |  |  | 3.9 |  |  | (5.3 | ) |  | (1.4 | )
Balance at March 31, 2019 | $ | 0.2 |  |  | $ | (6.2 | ) |  | $ | (14.7 | ) |  | $ | (20.7 | )
Schedule of Reclassification Out of Other Comprehensive Income | The table below details where reclassifications of realized transactions out of accumulated other comprehensive loss are recorded on the consolidated statements of income (amounts in millions):
| Year ended March 31, |  |
Description of AOCI Component | 2020 |  | 2019 |  | 2018 |  | Related Statement of Income Line
Unrealized losses on available-for-sale securities | $ | — |  |  | $ | (5.6 | ) |  | $ | (15.2 | ) |  | Other income, net
Amortization of actuarial loss | (0.8 | ) |  | (1.0 | ) |  | (0.8 | ) |  | Other income, net
Reclassification of realized transactions, net of taxes | $ | (0.8 | ) |  | $ | (6.6 | ) |  | $ | (16.0 | ) |  | Net Income

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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