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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Jun. 29, 2019
Jun. 30, 2018
Income Tax Disclosure [Line Items]              
U.S. federal corporate tax rate       21.00% 35.00%   28.17%
Provisional tax expense             $ 41.4
One-time transition tax expense             44.1
Benefit from remeasurement of deferred tax at new tax rate             2.7
One-time transition tax effect net on income tax payable       $ 11.9      
Non-discrete tax expense   $ 1.4          
Discrete tax benefit   $ (0.2)          
Provision/(benefit) for income taxes $ (15.3)   $ (3.9) (8.1) $ 52.6    
Gross unrecognized tax benefits 25.3     25.3     24.8
Gross unrecognized tax benefits increased (decreased) during the year       0.5      
Interest and penalties accrued related to unrecognized tax benefits 2.7     2.7      
Increase in interest and penalties accrued related to unrecognized tax benefits             $ 0.8
Maximum [Member]              
Income Tax Disclosure [Line Items]              
Estimated increase in unrecognized tax benefit in next twelve months $ 3.9     $ 3.9      
Cash Assets [Member]              
Income Tax Disclosure [Line Items]              
One-time transition tax rate on post-1986 foreign earnings and profits 15.50%     15.50%      
Other Specified Assets [Member]              
Income Tax Disclosure [Line Items]              
One-time transition tax rate on post-1986 foreign earnings and profits 8.00%     8.00%      
Scenario, Plan [Member]              
Income Tax Disclosure [Line Items]              
U.S. federal corporate tax rate           21.00%