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Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2017
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | $ 165.1 |  |
Acquisition | [1] |  |  | 1.3 |  |
Effect of exchange rate changes |  |  |  | 5.0 |  |
Goodwill, ending balance |  | $ 171.4 |  | 171.4 |  |
Amortized intangible assets [Abstract] |  |  |  |  |  |
Gross carrying value |  | 151.4 |  | 151.4 |  | $ 145.9
Accumulated amortization |  | (17.1) |  | (17.1) |  | (11.8)
Net intangible assets |  | 134.3 |  | 134.3 |  | 134.1
Amortization expense |  | 2.4 | $ 0.4 | 4.8 | $ 0.8 |
Estimated future amortization expense [Abstract] |  |  |  |  |  |
Remainder of 2018 |  | 4.9 |  | 4.9 |  |
2019 |  | 9.6 |  | 9.6 |  |
2020 |  | 9.5 |  | 9.5 |  |
2021 |  | 8.9 |  | 8.9 |  |
2022 |  | 7.7 |  | 7.7 |  |
2023 & Beyond |  | 93.7 |  | 93.7 |  |
Asia [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | 0.5 |  |
Acquisition | [1] |  |  | 0.0 |  |
Effect of exchange rate changes |  |  |  | 0.0 |  |
Goodwill, ending balance |  | 0.5 |  | 0.5 |  |
Building HVAC [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | 13.7 |  |
Acquisition | [1] |  |  | 0.0 |  |
Effect of exchange rate changes |  |  |  | 0.7 |  |
Goodwill, ending balance |  | 14.4 |  | 14.4 |  |
CIS [Member] |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill, beginning balance |  |  |  | 150.9 |  |
Acquisition | [1] |  |  | 1.3 |  |
Effect of exchange rate changes |  |  |  | 4.3 |  |
Goodwill, ending balance |  | 156.5 |  | 156.5 |  |
Customer Relationships [Member] |  |  |  |  |  |
Amortized intangible assets [Abstract] |  |  |  |  |  |
Gross carrying value |  | 63.2 |  | 63.2 |  | 60.5
Accumulated amortization |  | (3.7) |  | (3.7) |  | (1.7)
Net intangible assets |  | 59.5 |  | 59.5 |  | 58.8
Trade Names [Member] |  |  |  |  |  |
Amortized intangible assets [Abstract] |  |  |  |  |  |
Gross carrying value |  | 60.0 |  | 60.0 |  | 58.4
Accumulated amortization |  | (9.1) |  | (9.1) |  | (7.2)
Net intangible assets |  | 50.9 |  | 50.9 |  | 51.2
Acquired Technology [Member] |  |  |  |  |  |
Amortized intangible assets [Abstract] |  |  |  |  |  |
Gross carrying value |  | 28.2 |  | 28.2 |  | 27.0
Accumulated amortization |  | (4.3) |  | (4.3) |  | (2.9)
Net intangible assets |  | $ 23.9 |  | $ 23.9 |  | $ 24.1
[1] | During the first six months of fiscal 2018, the Company recorded a $1.3 million increase to goodwill as a result of measurement period adjustments made in connection with purchase accounting for the acquisition of Luvata HTS. See Note 2 for additional information.

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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