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Debt (Narrative - Senior Credit Facilities) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 22, 2018
Line of Credit Facility [Abstract] |  |  |
Quarterly principal payment percent, year four | 2.50% |  |
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 |  |
Number of possible increases in margin | 2 |  |
Effective interest rate | 2.74% |  |
Change in control, trigger percentage | 50.00% |  |
Letter of Credit |  |  |
Line of Credit Facility [Abstract] |  |  |
Letters of credit outstanding, amount | $ 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 | 0.75% |  |
LIBOR | Revolving Credit Facility |  |  |
Line of Credit Facility [Abstract] |  |  |
Basis spread on variable interest rate | 1.75% |  |
Potential increase in interest rate if certain leverage ratios are met, total | 0.50% |  |
Potential increase in interest rate if certain leverage ratios are met, per increase | 0.25% |  |
LIBOR | Minimum | Revolving Credit Facility |  |  |
Line of Credit Facility [Abstract] |  |  |
Coupon rate | 0.00% |  |
Term Loan A | Term Loan |  |  |
Line of Credit Facility [Abstract] |  |  |
Number of possible increases in margin | 2 |  |
Effective interest rate | 2.74% |  |
Quarterly principal payment percent | 1.25% |  |
Quarterly principal payment percent, year two | 1.75% |  |
Quarterly principal payment percent, year three | 2.50% |  |
Term Loan A | Base Rate | Term Loan |  |  |
Line of Credit Facility [Abstract] |  |  |
Basis spread on variable interest rate | 0.75% |  |
Term Loan A | LIBOR | Term Loan |  |  |
Line of Credit Facility [Abstract] |  |  |
Basis spread on variable interest rate | 1.75% | 1.75% |
Potential increase in interest rate if certain leverage ratios are met, total | 0.50% |  |
Potential increase in interest rate if certain leverage ratios are met, per increase | 0.25% |  |
Term Loan A | LIBOR | Minimum | Term Loan |  |  |
Line of Credit Facility [Abstract] |  |  |
Coupon rate | 0.00% |  |
Term Loan B | Term Loan |  |  |
Line of Credit Facility [Abstract] |  |  |
Effective interest rate | 3.24% |  |
Quarterly principal payment percent | 0.25% |  |
Term Loan B | Base Rate | Term Loan |  |  |
Line of Credit Facility [Abstract] |  |  |
Basis spread on variable interest rate | 1.25% |  |
Term Loan B | LIBOR | Term Loan |  |  |
Line of Credit Facility [Abstract] |  |  |
Basis spread on variable interest rate | 2.25% |  |
Term Loan B | LIBOR | Minimum | Term Loan |  |  |
Line of Credit Facility [Abstract] |  |  |
Coupon rate | 0.00% |  |

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