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Additional Financial Information (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 2,709.5	$ 2,855.0	$ 2,660.0	$ 2,921.9
Other comprehensive loss	7.1	(20.3)	0.5	(65.3)
Ending balance	2,714.3	2,842.3	2,714.3	2,842.3
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(18.8)
Other comprehensive loss			0.8
Ending balance	(18.0)		(18.0)
Net unrealized gain (loss) on cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(187.2)
Other comprehensive loss			(0.3)
Ending balance	(187.5)		(187.5)
Accumulated other comprehensive loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(212.6)	(125.3)	(206.0)	(80.3)
Other comprehensive loss	7.1	(20.3)	0.5	(65.3)
Ending balance	$ (205.5)	$ (145.6)	$ (205.5)	$ (145.6)

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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