Income Taxes (Details 4) - USD ($) $ in Millions	12 Months Ended
Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2017
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Unrecognized tax benefit liabilities, beginning of period	$ 89.3	$ 39.5	$ 30.4
Increases as a result of tax positions taken during a prior period	56.4	7.5	0.0
Decreases as a result of tax positions taken during a prior period	(1.4)	(0.1)	(11.5)
Increases as a result of tax positions taken during the current period	88.8	43.8	21.3
Decreases related to settlements with tax authorities	(0.8)	(0.4)	0.0
Decreases related to lapse of applicable statute of limitations	(8.0)	(1.0)	(0.7)
Unrecognized tax benefit liabilities, end of period	$ 224.3	$ 89.3	$ 39.5

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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Amount of unrecognized tax benefits.

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