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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Other comprehensive loss [Abstract] |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  | $ 533.9 |  |  |
Other comprehensive loss before reclassifications |  | $ (19.3) |  | $ (6.8) |  | (18.4) |  | $ (31.0) |
Reclassifications for amortization of unrecognized net loss | [1] | 1.4 |  | 1.3 |  | 2.8 |  | 2.6 |
Reclassifications for realized losses - net | [2] | 0.3 |  |  |  | 0.2 |  |  |
Reclassifications for foreign currency translation gains (losses) |  | (0.6) | [3] | 0.8 | [4] | (0.6) | [3] | 0.8 | [4]
Income taxes |  | (0.2) |  | (0.1) |  | (0.2) |  | (0.5) |
Total other comprehensive income (loss) |  | (18.4) |  | (4.8) |  | (16.2) |  | (28.1) |
Ending balance |  | 519.9 |  |  |  | 519.9 |  |  |
AIAC Air Conditioning South Africa Pty Ltd Member [Member] |  |  |  |  |  |  |  |  |
Other comprehensive loss [Abstract] |  |  |  |  |  |  |  |  |
Gain (loss) on write-off of accumulated foreign currency translation |  |  |  | (0.8) |  |  |  |  |
Nikkei Heat Exchanger Company, Ltd [Member] |  |  |  |  |  |  |  |  |
Other comprehensive loss [Abstract] |  |  |  |  |  |  |  |  |
Gain (loss) on write-off of accumulated foreign currency translation |  | 0.6 |  |  |  |  |  |  |
Accumulated Other Comprehensive Loss [Member] |  |  |  |  |  |  |  |  |
Other comprehensive loss [Abstract] |  |  |  |  |  |  |  |  |
Beginning balance |  | (176.2) |  | (163.6) |  | (178.4) |  | (140.3) |
Ending balance |  | (194.6) |  | (168.4) |  | (194.6) |  | (168.4) |
Foreign Currency Translation [Member] |  |  |  |  |  |  |  |  |
Other comprehensive loss [Abstract] |  |  |  |  |  |  |  |  |
Beginning balance |  | (40.7) |  | (30.2) |  | (42.6) |  | (5.5) |
Other comprehensive loss before reclassifications |  | (18.7) |  | (6.1) |  | (16.8) |  | (30.8) |
Reclassifications for amortization of unrecognized net loss | [1] | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |
Reclassifications for realized losses - net | [2] | 0.0 |  |  |  | 0.0 |  |  |
Reclassifications for foreign currency translation gains (losses) |  | (0.6) | [3] | 0.8 | [4] | (0.6) | [3] | 0.8 | [4]
Income taxes |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |
Total other comprehensive income (loss) |  | (19.3) |  | (5.3) |  | (17.4) |  | (30.0) |
Ending balance |  | (60.0) |  | (35.5) |  | (60.0) |  | (35.5) |
Defined Benefit Plans [Member] |  |  |  |  |  |  |  |  |
Other comprehensive loss [Abstract] |  |  |  |  |  |  |  |  |
Beginning balance |  | (135.2) |  | (133.9) |  | (136.3) |  | (134.9) |
Other comprehensive loss before reclassifications |  | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |
Reclassifications for amortization of unrecognized net loss | [1] | 1.4 |  | 1.3 |  | 2.8 |  | 2.6 |
Reclassifications for realized losses - net | [2] | 0.0 |  |  |  | 0.0 |  |  |
Reclassifications for foreign currency translation gains (losses) |  | 0.0 | [3] | 0.0 | [4] | 0.0 | [3] | 0.0 | [4]
Income taxes |  | (0.3) |  | (0.3) |  | (0.6) |  | (0.6) |
Total other comprehensive income (loss) |  | 1.1 |  | 1.0 |  | 2.2 |  | 2.0 |
Ending balance |  | (134.1) |  | (132.9) |  | (134.1) |  | (132.9) |
Cash Flow Hedges [Member] |  |  |  |  |  |  |  |  |
Other comprehensive loss [Abstract] |  |  |  |  |  |  |  |  |
Beginning balance |  | (0.3) |  | 0.5 |  | 0.5 |  | 0.1 |
Other comprehensive loss before reclassifications |  | (0.6) |  | (0.7) |  | (1.6) |  | (0.2) |
Reclassifications for amortization of unrecognized net loss | [1] | 0.0 |  | 0.0 |  | 0.0 |  | 0.0 |
Reclassifications for realized losses - net | [2] | 0.3 |  |  |  | 0.2 |  |  |
Reclassifications for foreign currency translation gains (losses) |  | 0.0 | [3] | 0.0 | [4] | 0.0 | [3] | 0.0 | [4]
Income taxes |  | 0.1 |  | 0.2 |  | 0.4 |  | 0.1 |
Total other comprehensive income (loss) |  | (0.2) |  | (0.5) |  | (1.0) |  | (0.1) |
Ending balance |  | $ (0.5) |  | $ 0.0 |  | $ (0.5) |  | $ 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 4 for additional information about the Company’s pension plans.
[2] | Amounts represent net gains and losses associated with cash flow hedges that were reclassified to net earnings.
[3] | As a result of the sale of its investment in NEX during the second quarter of fiscal 2020, the Company wrote off $0.6 million of accumulated foreign currency translation gains.
[4] | As a result of the sale of a business in South Africa during the second quarter of fiscal 2019, the Company wrote off $0.8 million of accumulated foreign currency translation losses.

X
- Definition Amount of foreign currency translation gain (loss) in the disposal group, including discontinued operation, recognized in the statement of income as a result of the sale or complete or substantially complete liquidation of an investment in a foreign entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL34724391-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e709-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e689-108580 + Details
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