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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Income Taxes [Line Items]
Net interest and penalties recognized related to uncertain tax positions	$ 5.0	$ 6.0	$ 1.2
Accrued interest related to unrecognized tax benefits	16.7	$ 13.2
Unrecognized tax benefits that if realized would impact effective tax rate	81.6
Unrecognized tax benefits estimated that may be realized in next 12 months	79.7
Foreign Tax Authority | Canada
Income Taxes [Line Items]
Net operating loss carryforwards	2.5
Foreign Tax Authority | Luxembourg
Income Taxes [Line Items]
Net operating loss carryforwards	235.1
Foreign Tax Authority | Other Foreign
Income Taxes [Line Items]
Net operating loss carryforwards	18.1
State and Local Jurisdiction
Income Taxes [Line Items]
Net operating loss carryforwards	988.2
Domestic Tax Authority | United States
Income Taxes [Line Items]
Net operating loss carryforwards	1,561.5
Credit carryforward	$ 73.0

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Income Taxes [Line Items]

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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