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Debt and Credit Facility - Credit Facility (Details) |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
May 18, 2018 USD ($) | May 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Feb. 28, 2017 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Debt issuance costs |  | $ 24,400,000 | $ 96,500,000 | $ 40,100,000 | $ 33,700,000
2015 Senior Convertible Debt |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt issuance costs |  |  | 13,300,000 | 14,800,000 |
Revolving Credit Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt issuance costs |  |  | 15,600,000 | 5,900,000 |
Settlement of Debt |  |  | 244,300,000 |  |
Term Loan Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt issuance costs |  |  | 28,700,000 | 0 |
Revolving credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit agreement maximum borrowing amount | $ 3,600,000,000.00 | 3,840,000,000.00 | 3,600,000,000.000 | 3,122,000,000.000 |
Debt issuance costs |  | 13,600,000 |  |  |
Credit Agreement, total consolidated debt, maximum |  |  | $ 700,000,000 |  |
Interest coverage ratio |  |  | 3.25 |  |
Interest rate spread on overdue principal in event of default (percentage) |  |  | 2.00% |  |
Interest rate spread on overdue amounts in event of default (percentage) |  |  | 2.00% |  |
Revolving credit facility | 2023 Tranche |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit agreement maximum borrowing amount | 3,600,000,000.00 |  |  |  |
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% |  |
Repayments of long-term debt |  |  | $ 267,000,000 | 20,000,000 |
Foreign line of credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit agreement maximum borrowing amount | 250,000,000.0 |  |  |  |
Standby letters of credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit agreement maximum borrowing amount | 50,000,000.0 |  |  |  |
Line of credit facility swingline loan sublimit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit agreement maximum borrowing amount | $ 25,000,000.0 |  |  |  |
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 one | Revolving credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit agreement, total leverage ratio, maximum |  |  | 6.75 |  |
Credit agreement, total leverage ratio, temporary maximum allowed, next three quarters |  |  | 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% |  |
Leverage ratio percent two | Revolving credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit agreement, total leverage ratio, maximum |  |  | 6.25 |  |
Credit agreement, total leverage ratio, temporary maximum allowed, next three quarters |  |  | 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% |  |
Leverage ration percent three | Revolving credit facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Credit agreement, total leverage ratio, maximum |  |  | 5.75 |  |
Credit agreement, total leverage ratio, temporary maximum allowed, next three quarters |  |  | 3.75 |  |
Leverage ration percent three | Revolving credit facility | Term Loan Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Mandatory prepayment of excess cash flow, percentage |  |  | 0.00% |  |
Term Loan Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt issuance costs |  |  | $ 2,900,000 | $ 200,000 |

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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