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Income Taxes (Tables)
 9 Months Ended
Dec. 31, 2018
Income Tax Disclosure [Abstract]  
Summary of unrecognized tax benefits
The following tables summarize the activity related to the Company’s gross unrecognized tax benefits for the nine months ended December 31, 2018 and the year ended March 31, 2018 (in millions):

 
Nine Months Ended December 31, 2018
Balance at March 31, 2018
$
436.0

Increases related to acquisitions
284.0

Decreases related to settlements with tax authorities
(3.2
)
Decreases related to statute of limitation expirations
(10.5
)
Increases related to current year tax positions
11.0

Decreases related to prior year tax positions
(36.9
)
Balance at December 31, 2018
$
680.4

 
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