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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% |

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