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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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Face (par) amount of debt instrument at time of issuance.

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