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Debt (Narrative - Senior Credit Facilities) (Details) - USD ($) $ in Millions |  | 6 Months Ended
--- | --- | ---
Mar. 22, 2018 | Sep. 30, 2019
Revolving Credit Facility |  |
Line of Credit Facility [Abstract] |  |
Revolving credit facility, maximum borrowing capacity |  | $ 1,500.0
Revolving credit facility, available amount |  | $ 1,500.0
Number of possible increases in margin |  | 2
Effective interest rate |  | 3.77%
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 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%
Term Loan A Facility | Term Loan |  |
Line of Credit Facility [Abstract] |  |
Number of possible increases in margin |  | 2
Effective interest rate |  | 3.77%
Quarterly principal payment percent |  | 1.25%
Quarterly principal payment percent, year two |  | 1.75%
Quarterly principal payment percent, year three |  | 2.50%
Quarterly principal payment percent, year four |  | 2.50%
Term Loan A Facility | Base Rate | Term Loan |  |
Line of Credit Facility [Abstract] |  |
Basis spread on variable interest rate |  | 0.75%
Term Loan A Facility | LIBOR | Term Loan |  |
Line of Credit Facility [Abstract] |  |
Basis spread on variable interest rate |  | 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%
Term Loan A Facility | LIBOR | Minimum | Term Loan |  |
Line of Credit Facility [Abstract] |  |
Coupon rate |  | 0.00%
Term Loan B Facility | Term Loan |  |
Line of Credit Facility [Abstract] |  |
Effective interest rate |  | 4.27%
Quarterly principal payment percent |  | 0.25%
Term Loan B Facility | Base Rate | Term Loan |  |
Line of Credit Facility [Abstract] |  |
Basis spread on variable interest rate | 1.25% |
Term Loan B Facility | LIBOR | Term Loan |  |
Line of Credit Facility [Abstract] |  |
Basis spread on variable interest rate | 2.25% |
Term Loan B Facility | LIBOR | Minimum | Term Loan |  |
Line of Credit Facility [Abstract] |  |
Coupon rate |  | 0.00%

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