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Debt (Narrative - Senior Credit Facilities) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Line of Credit Facility [Abstract]        
Loss on extinguishment of debt $ 0.0 $ (1.4) $ 0.0 $ (1.4)
Revolving Credit Facility        
Line of Credit Facility [Abstract]        
Revolving credit facility, maximum borrowing capacity 1,500.0   1,500.0  
Revolving credit facility, available amount $ 1,500.0   $ 1,500.0  
Number of possible increases in margin     2  
Effective interest rate 1.89%   1.89%  
Change in control, trigger percentage 50.00%   50.00%  
Letter of Credit        
Line of Credit Facility [Abstract]        
Letters of credit outstanding, amount $ 0.0   $ 0.0  
Minimum | Revolving Credit Facility        
Line of Credit Facility [Abstract]        
Revolving credit facility, commitment fee annual percentage     0.25%  
Maximum | Revolving Credit Facility        
Line of Credit Facility [Abstract]        
Revolving credit facility, commitment fee annual percentage     0.375%  
Base Rate | Revolving Credit Facility        
Line of Credit Facility [Abstract]        
Basis spread on variable interest rate (as a percent)     0.75%  
LIBOR | Revolving Credit Facility        
Line of Credit Facility [Abstract]        
Basis spread on variable interest rate (as a percent)     1.75%  
Potential increases in interest rate upon certain increases to leverage ratios, total     0.50%  
Potential increase in interest rate upon certain increases to leverage ratios, per increase     0.25%  
LIBOR | Minimum | Revolving Credit Facility        
Line of Credit Facility [Abstract]        
Coupon rate 0.00%   0.00%  
Term Loan A | Term Loan        
Line of Credit Facility [Abstract]        
Quarterly principal payment percent 1.25%   1.25%  
Quarterly principal payment percent, year two 1.75%   1.75%  
Quarterly principal payment percent, year three 2.50%   2.50%  
Quarterly principal payment percent, year four 2.50%   2.50%  
Term Loan B | Term Loan        
Line of Credit Facility [Abstract]        
Effective interest rate 2.39%   2.39%  
Quarterly principal payment percent 0.25%   0.25%  
Early repayments of debt principal outstanding, amount   $ 101.9   $ 101.9
Term Loan B | Base Rate | Term Loan        
Line of Credit Facility [Abstract]        
Basis spread on variable interest rate (as a percent)     1.25%  
Term Loan B | LIBOR | Term Loan        
Line of Credit Facility [Abstract]        
Basis spread on variable interest rate (as a percent)     2.25%  
Term Loan B | LIBOR | Minimum | Term Loan        
Line of Credit Facility [Abstract]        
Coupon rate 0.00%   0.00%