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Acquisitions (Details) - USD ($)
$ in Millions
Oct. 18, 2018
Apr. 30, 2019
Jul. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 308.8 $ 238.4
BOFA International LTD      
Business Acquisition [Line Items]      
Business acquisition, percentage of voting interests acquired 88.00%    
Business combination, consideration transferred $ 98.2    
Cash acquired 2.2    
Net tangible assets 12.2    
Intangibles acquired 45.7    
Goodwill 73.6    
Deferred tax liabilities 8.1    
Assumed debt $ 14.3    
Period after which exercise of options triggers purchase obligation (years) 3 years    
Remaining voting interest obligated to acquire (as a percentage) 12.00%    
BOFA International LTD | Minimum      
Business Acquisition [Line Items]      
Estimated useful lives of intangibles (in years) 5 years    
BOFA International LTD | Maximum      
Business Acquisition [Line Items]      
Estimated useful lives of intangibles (in years) 15 years