Income Taxes (Tables)

3 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Summary of Income Tax Contingencies

The following tables summarize the activity related to the Company’s gross unrecognized tax benefits for the three months ended June 30, 2018 and the year ended March 31, 2018 (in millions):

	Three Months Ended June 30, 2018
Balance at March 31, 2018	$	436.0
Increases related to acquisitions	284.0
Decreases related to settlements with tax authorities	—
Decreases related to statute of limitation expirations	(2.2		)
Increases related to current year tax positions	3.5
Decreases related to prior year tax positions	(11.6		)
Balance at June 30, 2018	$	709.7

	Year Ended March 31, 2018
Balance at March 31, 2017	$	398.5
Increases related to acquisitions	—
Decreases related to settlements with tax authorities	(0.1		)
Decreases related to statute of limitation expirations	(10.9		)
Increases related to current year tax positions	30.3
Increases related to prior year tax positions	18.2
Balance at March 31, 2018	$	436.0