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Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance			$ 168.5
Effect of exchange rate changes			(0.1)
Goodwill, ending balance	$ 168.4		168.4
Amortized intangible assets [Abstract]
Gross carrying value	144.5		144.5		$ 144.3
Accumulated amortization	(35.0)		(35.0)		(28.1)
Net intangible assets	109.5		109.5		116.2
Amortization expense	2.3	$ 2.2	6.7	$ 6.8
Estimated future amortization expense [Abstract]
Remainder of fiscal 2020	2.2		2.2
2021	8.0		8.0
2022	8.0		8.0
2023	8.0		8.0
2024	8.0		8.0
2025	8.0		8.0
VTS [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance			0.5
Effect of exchange rate changes			0.0
Goodwill, ending balance	0.5		0.5
CIS [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance			153.9
Effect of exchange rate changes			(0.4)
Goodwill, ending balance	153.5		153.5
BHVAC [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance			14.1
Effect of exchange rate changes			0.3
Goodwill, ending balance	14.4		14.4
Customer Relationships [Member]
Amortized intangible assets [Abstract]
Gross carrying value	61.5		61.5		61.5
Accumulated amortization	(11.9)		(11.9)		(9.1)
Net intangible assets	49.6		49.6		52.4
Trade Names [Member]
Amortized intangible assets [Abstract]
Gross carrying value	59.0		59.0		58.9
Accumulated amortization	(15.9)		(15.9)		(13.5)
Net intangible assets	43.1		43.1		45.4
Acquired Technology [Member]
Amortized intangible assets [Abstract]
Gross carrying value	24.0		24.0		23.9
Accumulated amortization	(7.2)		(7.2)		(5.5)
Net intangible assets	$ 16.8		$ 16.8		$ 18.4

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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.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth 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.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the 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.

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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.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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