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Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Cash flow hedges |  | $ (0.1) | $ 0.0
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 974.4 | (221.5) | (212.2)
Other comprehensive gain (loss) | 31.8 |  |
Ending balance | 1,035.3 | 974.4 | (221.5)
Accumulated Other Comprehensive Loss [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (30.3) | (1.3) | (2.2)
Ending balance | (62.1) | (30.3) | $ (1.3)
Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Cash flow hedges | 0.0 |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 0.2 |  |
Ending balance | 0.2 | 0.2 |
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Cash flow hedges | 0.8 |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Ending balance | 0.8 |  |
Foreign Currency Translation Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Cash flow hedges | (32.6) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (30.5) |  |
Ending balance | $ (63.1) | $ (30.5) |

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- Definition Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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