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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Accumulated Other Comprehensive Loss [Line Items] |  |  |
Beginning balance |  | $ 414.0 |
Other comprehensive income (loss) before reclassifications |  | 35.9 | $ (11.1)
Reclassifications for amortization of unrecognized net loss | [1] | 5.6 | 5.2
Reclassifications of realized gains | [2] | (0.1) |
Income taxes |  | 0.1 | (1.7)
Total other comprehensive income (loss) |  | 41.5 | (7.6)
Ending balance |  | 490.1 | 414.0
Accumulated Other Comprehensive Loss [Member] |  |  |
Accumulated Other Comprehensive Loss [Line Items] |  |  |
Beginning balance |  | (181.8) | (174.2)
Ending balance |  | (140.3) | (181.8)
Foreign Currency Translation [Member] |  |  |
Accumulated Other Comprehensive Loss [Line Items] |  |  |
Beginning balance |  | (46.8) | (36.0)
Other comprehensive income (loss) before reclassifications |  | 41.3 | (10.8)
Reclassifications for amortization of unrecognized net loss | [1] | 0.0 | 0.0
Reclassifications of realized gains | [2] | 0.0 |
Income taxes |  | 0.0 | 0.0
Total other comprehensive income (loss) |  | 41.3 | (10.8)
Ending balance |  | (5.5) | (46.8)
Defined Benefit Plans [Member] |  |  |
Accumulated Other Comprehensive Loss [Line Items] |  |  |
Beginning balance |  | (135.0) | (138.2)
Other comprehensive income (loss) before reclassifications |  | (5.7) | (0.3)
Reclassifications for amortization of unrecognized net loss | [1] | 5.6 | 5.2
Reclassifications of realized gains | [2] | 0.0 |
Income taxes |  | 0.2 | (1.7)
Total other comprehensive income (loss) |  | 0.1 | 3.2
Ending balance |  | (134.9) | (135.0)
Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Loss [Line Items] |  |  |
Beginning balance |  | 0.0 |
Other comprehensive income (loss) before reclassifications |  | 0.3 |
Reclassifications for amortization of unrecognized net loss | [1] | 0.0 |
Reclassifications of realized gains | [2] | (0.1) |
Income taxes |  | (0.1) |
Total other comprehensive income (loss) |  | 0.1 |
Ending balance |  | $ 0.1 | $ 0.0
[1] | Amounts are included in the calculation of net periodic benefit cost for the Company's defined benefit plans, which include pension and other postretirement plans. See Note 16 for additional information about the Company's pension plans.
[2] | Amounts reclassified to net earnings. See Note 17 for additional information regarding derivative instruments.

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent. + 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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