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Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Amortized intangible assets [Abstract] |  |  |
Gross carrying value | $ 144.3 | $ 150.0 |
Accumulated amortization | (28.1) | (20.1) |
Net intangible assets | 116.2 | 129.9 |
Amortization expense | 9.0 | 9.7 | $ 4.1
Estimated future amortization expense [Abstract] |  |  |
Fiscal 2020 | 9.0 |  |
2021 | 8.0 |  |
2022 | 8.0 |  |
2023 | 8.0 |  |
2024 | 8.0 |  |
BHVAC [Member] |  |  |
Amortized intangible assets [Abstract] |  |  |
Impairment |  | 1.2 |
BHVAC [Member] | Maximum [Member] |  |  |
Amortized intangible assets [Abstract] |  |  |
Annual revenue for discontinued product |  | 1.0 |
Customer Relationships [Member] |  |  |
Amortized intangible assets [Abstract] |  |  |
Gross carrying value | 61.5 | 64.2 |
Accumulated amortization | (9.1) | (5.7) |
Net intangible assets | 52.4 | 58.5 |
Trade Names [Member] |  |  |
Amortized intangible assets [Abstract] |  |  |
Gross carrying value | 58.9 | 60.6 |
Accumulated amortization | (13.5) | (10.8) |
Net intangible assets | 45.4 | 49.8 |
Acquired Technology [Member] |  |  |
Amortized intangible assets [Abstract] |  |  |
Gross carrying value | 23.9 | 25.2 |
Accumulated amortization | (5.5) | (3.6) |
Net intangible assets | $ 18.4 | $ 21.6 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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