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Additional Financial Information (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Apr. 01, 2018	Apr. 01, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 3,156.9	$ 2,514.4	$ 850.3
Cumulative effect of accounting changes				$ 18.7	$ 60.8
Other comprehensive loss	(68.0)	6.3	27.1
Ending balance	2,921.9	3,156.9	2,514.4
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(12.4)	(19.4)	(11.3)
Reclassification adjustment for gain on available-for-sale securities realized in net income			0.0
Other comprehensive income (loss)			(8.1)
Cumulative effect of accounting changes				0.0
Other comprehensive loss	(5.8)	7.0
Ending balance	(18.2)	(12.4)	(19.4)
Net unrealized gain (loss) on available-for-sale securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	2.6	3.1	(35.5)
Reclassification adjustment for gain on available-for-sale securities realized in net income			(17.8)
Other comprehensive income (loss)			56.4
Cumulative effect of accounting changes				(2.6)
Other comprehensive loss	0.0	(0.5)
Ending balance	0.0	2.6	3.1
Net unrealized gain (loss) on cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	0.1	0.3	3.7
Reclassification adjustment for gain on available-for-sale securities realized in net income			0.0
Other comprehensive income (loss)			(3.4)
Cumulative effect of accounting changes				0.0
Other comprehensive loss	(62.2)	(0.2)
Ending balance	(62.1)	0.1	0.3
Accumulated other comprehensive loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(9.7)	(16.0)	(43.1)
Reclassification adjustment for gain on available-for-sale securities realized in net income			(17.8)
Other comprehensive income (loss)			44.9
Cumulative effect of accounting changes				$ (2.6)
Other comprehensive loss	(68.0)	6.3	27.1
Ending balance	$ (80.3)	$ (9.7)	$ (16.0)

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