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Income Taxes - Summary of Domestic and Foreign Components of (Loss) Before Provision for Income Taxes and the Provision for Income Taxes (Detail)

v3.21.2
Income Taxes - Summary of Domestic and Foreign Components of (Loss) Before Provision for Income Taxes and the Provision for Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Income Tax Disclosure [Line Items]      
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest $ (164.3) $ (124.6) $ (126.2)
Current:      
Current Income Tax Expense (Benefit) 12.1 10.5 12.6
Deferred:      
Deferred Income Tax Expense (Benefit) (18.0) (16.0) (16.8)
Total benefit from income taxes (5.9) (5.5) (4.2)
United Kingdom      
Income Tax Disclosure [Line Items]      
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (125.3) (118.2) (96.3)
Current:      
Current Income Tax Expense (Benefit) 0.3 0.6 1.1
Deferred:      
Deferred Income Tax Expense (Benefit) 0.0 (0.4) (0.3)
United States      
Income Tax Disclosure [Line Items]      
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest (53.8) (24.5) (42.0)
Current:      
Current Income Tax Expense (Benefit) 2.4 (6.2) 1.9
Deferred:      
Deferred Income Tax Expense (Benefit) (15.5) 1.3 (7.2)
Other foreign      
Income Tax Disclosure [Line Items]      
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest 14.8 18.1 12.1
Current:      
Current Income Tax Expense (Benefit) 9.4 16.1 9.6
Deferred:      
Deferred Income Tax Expense (Benefit) $ (2.5) $ (16.9) $ (9.3)