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Debt and Credit Facility - Credit Facility (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 18, 2018 USD ($) | May 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 01, 2018 USD ($) | Mar. 31, 2018 USD ($) | Feb. 28, 2017 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance costs |  | $ 24,400,000 | $ 101,200,000 |  | $ 101,200,000 |  |  | $ 40,100,000 | $ 33,700,000
Interest expense |  |  | 138,600,000 | $ 49,500,000 | $ 229,000,000 | $ 98,900,000 |  |  |
2015 Senior Convertible Debt |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Remaining period, in years, over which unamortized debt discount will be recognized as non-cash interest expense (in years) |  |  |  |  | 6 years 4 months 16 days |  |  |  |
Debt issuance costs |  |  | 13,800,000 |  | $ 13,800,000 |  |  | 14,800,000 |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  | 16,500,000 |  | 16,500,000 |  |  | 5,900,000 |
Loans terminated |  |  | 244,300,000 |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  | 30,000,000 |  | 30,000,000 |  |  | 0 |
Revolving credit facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit agreement maximum borrowing amount | $ 3,600,000,000 | 3,840,000,000.00 |  |  |  |  | $ 3,600,000,000.0 | $ 3,122,000,000.000 |
Debt issuance costs |  | 13,600,000 |  |  |  |  |  |  |
Interest expense |  |  | 34,700,000 | $ 2,300,000 | 49,500,000 | $ 5,000,000 |  |  |
Credit Agreement, total consolidated debt, maximum |  |  | $ 700,000,000 |  | $ 700,000,000 |  |  |  |
Interest coverage ratio |  |  | 3.25 |  | 3.25 |  |  |  |
Interest rate spread on overdue principal in event of default (percentage) |  |  | 2.00% |  | 2.00% |  |  |  |
Interest rate spread on overdue amounts in event of default (percentage) |  |  | 2.00% |  | 2.00% |  |  |  |
Revolving credit facility | 2023 Tranche |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit agreement maximum borrowing amount | 3,600,000,000 |  |  |  |  |  |  |  |
Revolving credit facility | Term Loan Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance costs |  | 34,700,000 |  |  |  |  |  |  |
Proceeds from borrowings on term loan facility |  | $ 3,000,000,000 |  |  |  |  |  |  |
Quarterly amortization payments, percent |  |  | 0.25% |  | 0.25% |  |  |  |
Repayments of long-term debt |  |  | $ 267,000,000 |  |  |  |  |  |
Foreign line of credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit agreement maximum borrowing amount | 250,000,000 |  |  |  |  |  |  |  |
Standby letters of credit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit agreement maximum borrowing amount | 50,000,000 |  |  |  |  |  |  |  |
Line of credit facility swingline loan sublimit |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit agreement maximum borrowing amount | $ 25,000,000 |  |  |  |  |  |  |  |
Base Rate | Minimum | Revolving credit facility | 2023 Tranche |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Spread on variable rate (percentage) | 0.00% |  |  |  |  |  |  |  |
Base Rate | Maximum | Revolving credit facility | 2023 Tranche |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Spread on variable rate (percentage) | 1.00% |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Minimum | Revolving credit facility | 2023 Tranche |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Spread on variable rate (percentage) | 1.00% |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Maximum | Revolving credit facility | 2023 Tranche |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Spread on variable rate (percentage) | 2.00% |  |  |  |  |  |  |  |
Leverage Ratio Percent Three | Revolving credit facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit agreement, total leverage ratio, maximum |  |  | 5.75 |  | 5.75 |  |  |  |
Credit agreement, total leverage ratio, temporary maximum allowed, next three quarters |  |  | 3.75 |  | 3.75 |  |  |  |
Leverage Ratio Percent Three | Revolving credit facility | Term Loan Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Mandatory prepayment of excess cash flow, percentage |  |  | 0.00% |  | 0.00% |  |  |  |
Leverage Ratio Percent One | Revolving credit facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit agreement, total leverage ratio, maximum |  |  | 6.75 |  | 6.75 |  |  |  |
Credit agreement, total leverage ratio, temporary maximum allowed, next three quarters |  |  | 4.75 |  | 4.75 |  |  |  |
Leverage Ratio Percent One | Revolving credit facility | Term Loan Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Mandatory prepayment of excess cash flow, percentage |  |  | 50.00% |  | 50.00% |  |  |  |
Leverage Ratio Percent Two | Revolving credit facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit agreement, total leverage ratio, maximum |  |  | 6.25 |  | 6.25 |  |  |  |
Credit agreement, total leverage ratio, temporary maximum allowed, next three quarters |  |  | 4.25 |  | 4.25 |  |  |  |
Leverage Ratio Percent Two | Revolving credit facility | Term Loan Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Mandatory prepayment of excess cash flow, percentage |  |  | 25.00% |  | 25.00% |  |  |  |
Term Loan Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  | $ 2,900,000 |  | $ 2,900,000 |  |  |  |

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