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Debt - 2020 New Debt (Details) € in Thousands, $ in Thousands |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 21, 2020 USD ($) | Aug. 21, 2020 CAD ($) | Aug. 21, 2020 EUR (€) | Aug. 18, 2020 USD ($) | Jul. 02, 2020 USD ($) | Jun. 29, 2020 USD ($) | Jun. 22, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sales of senior notes |  |  |  |  |  |  |  |  |  |  | $ 3,465,000,000 | $ 987,500,000 |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  | $ 51,260,000 |  | $ 0 | $ 68,300,000 | $ 0 |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Net proceeds from sales of senior notes |  |  |  |  |  |  | $ 2,376,000,000 |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  | 35,950,000 | $ 17,040,000 |  |  |  |  |
Senior Notes | Senior Notes 5 Percent due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  |
Senior Notes | Senior Notes 5.25 Percent due 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | 1,300,000,000 |  |  |  |  |  |  |
Senior Notes | Senior Notes 5.625 Percent due 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |
Senior Notes | Senior Notes 4.375 Percent due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Debt redeemed |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Senior Notes | Senior Notes 6% percent due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  |  | 102.00% |  |  |  |  |  |  |  |
Debt redeemed |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |
Senior Notes | Senior Subordinated Notes 5 3/4% percent due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  | 100.958% |  |  |  |  |  |  |  |  |
Debt redeemed |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  | $ 15,310,000 |  |  |  |  |  |
Senior Notes | Senior Notes 4.5 Percent Due 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Net proceeds from sales of senior notes |  |  |  | $ 1,089,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | Senior CAD Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage | 104.031% | 104.031% | 104.031% |  |  |  |  |  |  |  |  |  |  |
Debt redeemed |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Senior Euro Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage | 101.50% | 101.50% | 101.50% |  |  |  |  |  |  |  |  |  |  |
Debt redeemed | € |  |  | € 300,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes | CAD Senior Notes 5.375 Percent due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage | 106.628% | 106.628% | 106.628% |  |  |  |  |  |  |  |  |  |  |
Debt redeemed | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable Securitization Program |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 | $ 275,000,000

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