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Segment and Geographic Information, Net sales by End Market (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Revenue from External Customer [Line Items] |  |  |
Net sales | $ 2,103.1 | $ 1,503.0 | $ 1,352.5
Automotive [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | 526.0 | 461.0 | 396.8
Commercial Vehicle [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | 381.7 | 382.5 | 459.8
Off-Highway [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | 271.2 | 202.8 | 206.2
Other Vehicular [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | 61.9 | 55.8 | 57.6
Commercial & Residential Air Conditioning [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | 371.3 | 136.5 | 48.8
Commercial Refrigeration [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | 158.7 | 52.2 | 0.0
Other HVAC&R [Member] |  |  |
Revenue from External Customer [Line Items] |  |  |
Net sales | $ 332.3 | $ 212.2 | $ 183.3

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