The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

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Derivative Financial Instruments - Narrative (Details) $ in Millions	12 Months Ended
	Mar. 31, 2019 USD ($) derivative	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Interest rate swap
Derivatives, Fair Value [Line Items]
Number of interest rate derivatives held \| derivative	3
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest \| Reclassification out of Accumulated Other Comprehensive Income \| Interest Rate Contract
Derivatives, Fair Value [Line Items]
Amount reclassified from accumulated other comprehensive loss into earnings \| $	$ 5.7	$ 9.7	$ 10.2