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Recently Issued Accounting Standards (Details) - USD ($)
$ in Millions
Jan. 31, 2020
May 01, 2019
Apr. 30, 2019
Operating lease right-of-use assets $ 168.0   $ 0.0
Total operating lease liabilities 175.2    
Accounting Standards Update 2016-02 [Member]      
Operating lease right-of-use assets   $ 159.2  
Total operating lease liabilities   $ 166.6  
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2018-15 [Member] | Other Noncurrent Assets [Member]      
Capitalized third-party cloud computing implementation costs $ 3.4