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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Schedule of Changes in Components of Accumulated Other Comprehensive Income | The following table presents the changes in the components of accumulated other comprehensive loss (AOCI), net of tax, for the nine months ended December 31, 2019 (in millions):
| Unrealized holding gains (losses) available-for-sale debt securities |  | Defined benefit pension plans |  | Foreign Currency |  | Total
Accumulated other comprehensive income (loss) 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 | — |  |  | 0.1 |  |  | (0.7 | ) |  | (0.6 | )
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | 0.6 |  |  | — |  |  | 0.6 |
Net other comprehensive income (loss) | — |  |  | 0.7 |  |  | (0.7 | ) |  | — |
Accumulated other comprehensive loss at December 31, 2019 | $ | — |  |  | $ | (6.6 | ) |  | $ | (15.4 | ) |  | $ | (22.0 | )
Schedule of Reclassification Out of Other Comprehensive Income | The table below details where reclassifications of realized transactions out of AOCI are recorded on the condensed consolidated statements of income (in millions):
|  |  |  | Three Months Ended |  | Nine Months Ended
|  |  |  | December 31, |  | December 31,
Description of AOCI Component |  | Related Statements of Income Line |  | 2019 |  | 2018 |  | 2019 |  | 2018
Unrealized losses on available-for-sale debt securities |  | Other loss, net |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (5.6 | )
Amortization of actuarial loss |  | Other loss, net |  | (0.2 | ) |  | (0.3 | ) |  | (0.6 | ) |  | (0.8 | )
Reclassification of realized transactions, net of taxes |  | Net income |  | $ | (0.2 | ) |  | $ | (0.3 | ) |  | $ | (0.6 | ) |  | $ | (6.4 | )

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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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