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Debt and Credit Facility - Credit Facility (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Line of Credit Facility [Line Items] |  |  |  |  |
Debt issuance amortization | $ 24,400,000 | $ 77,600,000 |  | $ 83,600,000 |
Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity | 3,840,000,000 | 3,600,000,000 |  | 3,600,000,000 | $ 3,120,000,000
Debt issuance amortization | 13,600,000 |  |  |  |
Extinguishment of debt, amount |  |  |  | 244,300,000 |
Proceeds from borrowings on revolving loan under credit facility |  | 204,000,000.0 | $ 3,485,500,000 |  |
Total consolidated debt, maximum |  | $ 700,000,000 |  |  |
Interest coverage ratio, less than |  | 3.25 |  |  |
Interest rate spread on overdue principal in event of default |  | 2.00% |  |  |
Interest rate spread on overdue amounts in event of default |  | 2.00% |  |  |
Term Loan Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt issuance amortization | 34,700,000 |  |  |  |
Proceeds from borrowings on term loan facility | $ 3,000,000,000.0 |  |  |  |
Quarterly amortization payments, percent |  | 0.25% |  |  |
Repayments of long-term debt |  | $ 188,000,000.0 |  | 1,090,000,000.00 |
Proceeds from borrowings on revolving loan under credit facility |  | 0 | $ 3,000,000,000.0 | 500,000,000.0 |
Loss on settlement of debt |  | 1,900,000 |  | $ 11,500,000 |
Foreign Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | 250,000,000.0 |  |  |
Standby Letters of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | 50,000,000.0 |  |  |
Line of Credit Facility Swingline Loan Sublimit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | 25,000,000.0 |  |  |
2023 Tranche | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity |  | $ 3,600,000,000 |  |  |
Leverage Ratio Percent One | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total leverage ratio, maximum |  | 6.75 |  |  |
Total leverage ratio, temporary maximum allowed, next three quarters |  | 4.75 |  |  |
Leverage Ratio Percent One | Term Loan Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Mandatory prepayment of excess cash flow, percentage |  | 50.00% |  |  |
Leverage Ratio Percent Two | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total leverage ratio, maximum |  | 6.25 |  |  |
Total leverage ratio, temporary maximum allowed, next three quarters |  | 4.25 |  |  |
Leverage Ratio Percent Two | Term Loan Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Mandatory prepayment of excess cash flow, percentage |  | 25.00% |  |  |
Leverage Ratio Percent Three | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total leverage ratio, maximum |  | 5.75 |  |  |
Total leverage ratio, temporary maximum allowed, next three quarters |  | 3.75 |  |  |
Leverage Ratio Percent Three | Term Loan Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Mandatory prepayment of excess cash flow, percentage |  | 0.00% |  |  |
Minimum | Base Rate | 2023 Tranche | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 0.00% |  |  |
Minimum | London Interbank Offered Rate (LIBOR) | 2023 Tranche | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |
Maximum | Base Rate | 2023 Tranche | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |
Maximum | London Interbank Offered Rate (LIBOR) | 2023 Tranche | Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 2.00% |  |  |

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