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Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Schedule of accumulated other comprehensive income (loss) | The following table presents the changes in the components of accumulated other comprehensive income (loss) (AOCI), net of tax, for the nine months ended December 31, 2018 (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, 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 | ) |  | 4.5 |  |  | (3.0 | ) |  | (4.1 | )
Amounts reclassified from accumulated other comprehensive (loss) income | 5.6 |  |  | 0.8 |  |  | — |  |  | 6.4 |
Net other comprehensive income (loss) | — |  |  | 5.3 |  |  | (3.0 | ) |  | 2.3 |
Accumulated other comprehensive income (loss) at December 31, 2018 | $ | 0.2 |  |  | $ | (4.8 | ) |  | $ | (12.4 | ) |  | $ | (17.0 | )
Schedule of reclassification out of accumulated other comprehensive income | The table below details where reclassifications of realized transactions out of AOCI are recorded on the condensed consolidated statements of operations (in millions):
|  | Three Months Ended |  | Nine Months Ended |  |
|  | December 31, |  | December 31, |  |
Description of AOCI Component |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | Related Statement of Operations Line
Unrealized losses on available-for-sale debt securities |  | $ | — |  |  | $ | — |  |  | $ | (5.6 | ) |  | $ | — |  |  | Other income (loss)
Amortization of actuarial loss |  | (0.3 | ) |  | (0.2 | ) |  | (0.8 | ) |  | (0.6 | ) |  | Other income (loss)
Reclassification of realized transactions, net of taxes |  | $ | (0.3 | ) |  | $ | (0.2 | ) |  | $ | (6.4 | ) |  | $ | (0.6 | ) |  | 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=114867106&loc=SL7669686-108580 + Details
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