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Income Taxes (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
	Dec. 21, 2017	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Income Taxes [Line Items]
Federal statutory income tax rate	35.00%	21.00%	21.00%
Unrecognized tax benefits that if realized would impact effective tax rate		$ 12.8
Unrecognized tax benefits estimated that may be realized in next 12 months		4.9
Foreign Tax Authority | Canada
Income Taxes [Line Items]
Net operating loss carryforwards		57.2
Foreign Tax Authority | Luxembourg
Income Taxes [Line Items]
Net operating loss carryforwards		768.8
State and Local Jurisdiction
Income Taxes [Line Items]
Net operating loss carryforwards		881.2
Domestic Tax Authority | United States
Income Taxes [Line Items]
Net operating loss carryforwards		1,660.6
Credit carryforward		$ 76.2
Pro Forma
Income Taxes [Line Items]
Federal statutory income tax rate				31.50%

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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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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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