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Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Sep. 30, 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 six months ended September 30, 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 | ) |  | 3.5 |  |  | (1.4 | ) |  | (3.5 | )
Amounts reclassified from accumulated other comprehensive loss | 5.6 |  |  | 0.5 |  |  | — |  |  | 6.1 |
Net other comprehensive income (loss) | — |  |  | 4.0 |  |  | (1.4 | ) |  | 2.6 |
Accumulated other comprehensive income (loss) at September 30, 2018 | $ | 0.2 |  |  | $ | (6.1 | ) |  | $ | (10.8 | ) |  | $ | (16.7 | )
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 income (in millions):
|  | Three Months Ended |  | Six Months Ended |  |
|  | September 30, |  | September 30, |  |
Description of AOCI Component |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | Related Statement of Income Line
Unrealized losses on available-for-sale debt securities |  | $ | — |  |  | $ | — |  |  | $ | 5.6 |  |  | $ | — |  |  | Other income (loss)
Amortization of actuarial loss |  | 0.2 |  |  | — |  |  | 0.5 |  |  | — |  |  | Other income (loss)
Reclassification of realized transactions, net of taxes |  | $ | 0.2 |  |  | $ | — |  |  | $ | 6.1 |  |  | $ | — |  |  | 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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