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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Other comprehensive loss [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  | $ 533.9 |  |  |
Other comprehensive income (loss) before reclassifications |  | $ 14.1 |  |  | $ (3.2) |  |  | (4.3) |  | $ (34.2) |
Reclassifications for amortization of unrecognized net loss | [1] | 1.4 |  |  | 1.3 |  |  | 4.2 |  | 3.9 |
Reclassifications for realized losses - net | [2] | 0.5 |  |  |  |  |  | 0.7 |  |  |
Reclassifications for foreign currency translation gains (losses) |  | 0.0 | [3] |  | 0.0 | [4] |  | (0.6) | [3] | 0.8 | [4]
Income taxes |  | (0.6) |  |  | (0.1) |  |  | (0.8) |  | (0.6) |
Total other comprehensive income (loss) |  | 15.4 |  |  | (2.0) |  |  | (0.8) |  | (30.1) |
Ending balance |  | 537.3 |  |  |  |  |  | 537.3 |  |  |
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 |  | (194.6) |  |  | (168.4) |  |  | (178.4) |  | (140.3) |
Ending balance |  | (179.2) |  | (194.6) | (170.4) |  | (168.4) | (179.2) |  | (170.4) |
Foreign Currency Translation [Member] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (60.0) |  |  | (35.5) |  |  | (42.6) |  | (5.5) |
Other comprehensive income (loss) before reclassifications |  | 13.8 |  |  | (2.1) |  |  | (3.0) |  | (32.9) |
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) |  | 0.0 | [3] |  | 0.0 | [4] |  | (0.6) | [3] | 0.8 | [4]
Income taxes |  | 0.0 |  |  | 0.0 |  |  | 0.0 |  | 0.0 |
Total other comprehensive income (loss) |  | 13.8 |  |  | (2.1) |  |  | (3.6) |  | (32.1) |
Ending balance |  | (46.2) |  | (60.0) | (37.6) |  | (35.5) | (46.2) |  | (37.6) |
Defined Benefit Plans [Member] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (134.1) |  |  | (132.9) |  |  | (136.3) |  | (134.9) |
Other comprehensive income (loss) before reclassifications |  | 0.0 |  |  | 0.0 |  |  | 0.0 |  | 0.0 |
Reclassifications for amortization of unrecognized net loss | [1] | 1.4 |  |  | 1.3 |  |  | 4.2 |  | 3.9 |
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 |  | (0.4) |  |  | (0.3) |  |  | (1.0) |  | (0.9) |
Total other comprehensive income (loss) |  | 1.0 |  |  | 1.0 |  |  | 3.2 |  | 3.0 |
Ending balance |  | (133.1) |  | (134.1) | (131.9) |  | (132.9) | (133.1) |  | (131.9) |
Cash Flow Hedges [Member] |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss [Abstract] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | (0.5) |  |  | 0.0 |  |  | 0.5 |  | 0.1 |
Other comprehensive income (loss) before reclassifications |  | 0.3 |  |  | (1.1) |  |  | (1.3) |  | (1.3) |
Reclassifications for amortization of unrecognized net loss | [1] | 0.0 |  |  | 0.0 |  |  | 0.0 |  | 0.0 |
Reclassifications for realized losses - net | [2] | 0.5 |  |  |  |  |  | 0.7 |  |  |
Reclassifications for foreign currency translation gains (losses) |  | 0.0 | [3] |  | 0.0 | [4] |  | 0.0 | [3] | 0.0 | [4]
Income taxes |  | (0.2) |  |  | 0.2 |  |  | 0.2 |  | 0.3 |
Total other comprehensive income (loss) |  | 0.6 |  |  | (0.9) |  |  | (0.4) |  | (1.0) |
Ending balance |  | $ 0.1 |  | $ (0.5) | $ (0.9) |  | $ 0.0 | $ 0.1 |  | $ (0.9) |
[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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