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Income Taxes (Narrative) (Details) - USD ($) $ in Millions			12 Months Ended
	Dec. 22, 2017	Dec. 21, 2017	Mar. 31, 2019	Mar. 31, 2018
Income Taxes [Line Items]
Federal statutory income tax rate	21.00%	35.00%	21.00%
Unrecognized tax benefits that if realized would impact effective tax rate			$ 17.6
Unrecognized tax benefits estimated that may be realized in next 12 months			3.8
Foreign Tax Authority | Canada
Income Taxes [Line Items]
Net operating loss carryforwards			106.9
Foreign Tax Authority | Luxembourg
Income Taxes [Line Items]
Net operating loss carryforwards			947.0
State and Local Jurisdiction
Income Taxes [Line Items]
Net operating loss carryforwards			791.3
Domestic Tax Authority | United States
Income Taxes [Line Items]
Net operating loss carryforwards			1,367.9
Credit carryforward			$ 74.2
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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