Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Intangible Assets [Abstract]
Gross carrying value	$ 138.2	$ 142.7
Accumulated amortization	(37.6)	(36.4)
Net intangible assets	100.6	106.3
Amortization expense	8.5	8.9	$ 9.0
Estimated Future Amortization Expense [Abstract]
Fiscal 2022	8.4
Fiscal 2023	8.0
Fiscal 2024	8.0
Fiscal 2025	8.0
Fiscal 2026	8.0
Customer Relationships [Member]
Intangible Assets [Abstract]
Gross carrying value	62.8	60.8
Accumulated amortization	(16.9)	(12.6)
Net intangible assets	45.9	48.2
Trade Names [Member]
Intangible Assets [Abstract]
Gross carrying value	51.5	58.3
Accumulated amortization	(11.4)	(16.2)
Net intangible assets	40.1	42.1
Acquired Technology [Member]
Intangible Assets [Abstract]
Gross carrying value	23.9	23.6
Accumulated amortization	(9.3)	(7.6)
Net intangible assets	$ 14.6	$ 16.0

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 for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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

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