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Additional Financial Information (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2018	Apr. 01, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 3,156.9
Cumulative effect of accounting changes		$ 18.7
Other comprehensive loss	(32.1)
Ending balance	3,070.3
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(12.4)
Cumulative effect of accounting changes		0.0
Other comprehensive loss	(7.2)
Ending balance	(19.6)
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
Cumulative effect of accounting changes		(2.6)
Other comprehensive loss	0.0
Ending balance	0.0
Net unrealized gain (loss) on cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	0.1
Cumulative effect of accounting changes		0.0
Other comprehensive loss	(24.9)
Ending balance	(24.8)
Accumulated other comprehensive loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(9.7)
Cumulative effect of accounting changes		$ (2.6)
Other comprehensive loss	(32.1)
Ending balance	$ (44.4)

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

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