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Significant Accounting Policies, Leases (Details)
$ in Millions
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Lease
Leases [Abstract]      
Right-of-use assets $ 54.1 $ 61.4  
Operating lease liabilities, current $ 11.2 $ 10.9  
Operating lease liabilities, current, Statement of Financial Position [Extensible List] Other Liabilities, Current Other Liabilities, Current  
Operating lease liabilities, noncurrent $ 44.8 $ 50.3  
Operating lease liabilities, noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent Other Liabilities, Noncurrent  
Operating lease liabilities $ 56.0    
Lease Accounting Guidance [Member]      
Leases [Abstract]      
Right-of-use assets     $ 61.3
Operating lease liabilities, current     $ 12.4
Operating lease liabilities, current, Statement of Financial Position [Extensible List]     Other Liabilities, Current
Operating lease liabilities, noncurrent     $ 48.9
Operating lease liabilities, noncurrent, Statement of Financial Position [Extensible List]     Other Liabilities, Noncurrent
Lease Accounting Guidance [Member] | Build-to-Suit Arrangements [Member]      
Leases [Abstract]      
Right-of-use assets     $ 5.2
Operating lease liabilities     $ 5.2
Number of operating leases | Lease     2