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Business Combinations - Air-X-Changers Narratives (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Jul. 01, 2019 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019
Business Acquisition |  |  |  |
Payment for acquisition of businesses, net of cash acquired |  | $ 0.0 |  | $ 2.8
AXC |  |  |  |
Business Acquisition |  |  |  |
Payment for acquisition of businesses, net of cash acquired | $ 599.7 |  |  |
Payments for acquisition of business excluding working capital adjustments |  |  | $ 592.0 |
Payment for working capital adjustments |  |  | $ 7.7 |
AXC | Minimum |  |  |  |
Business Acquisition |  |  |  |
Finite lived intangible assets useful life | 1 year |  |  |
AXC | Maximum |  |  |  |
Business Acquisition |  |  |  |
Finite lived intangible assets useful life | 14 years |  |  |

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