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Debt and Finance Leases - Recourse Debt Redemption Period (Details) - Recourse Debt	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2019
Senior Notes
Debt Instrument [Line Items]
Average Early Redemption Percentage			25.00%
Senior Notes due 2026 | Treasury Rate
Debt Instrument [Line Items]
Premium percentage of principal amount of note discount factor (as percent)			1.00%
Treasury rate redemption (as percentage)			0.50%
Senior Notes due 2027
Debt Instrument [Line Items]
Average Early Redemption Percentage	103.06%
Senior Notes due 2027 | Treasury Rate
Debt Instrument [Line Items]
Premium percentage of principal amount of note discount factor (as percent)			1.00%
Treasury rate redemption (as percentage)			50.00%
Senior Notes due 2028
Debt Instrument [Line Items]
Average Early Redemption Percentage	99.13%	99.24%
Redemption percentage			35.00%
Senior Notes due 2028 | Treasury Rate
Debt Instrument [Line Items]
Premium percentage of principal amount of note discount factor (as percent)			1.00%
Treasury rate redemption (as percentage)			50.00%
Senior Notes due 2029
Debt Instrument [Line Items]
Redemption percentage			40.00%
Senior Notes due 2029 | Treasury Rate
Debt Instrument [Line Items]
Treasury rate redemption (as percentage)			0.50%
Redemption Period Prior To 15 May 2021 | Senior Notes due 2026
Debt Instrument [Line Items]
Redemption percentage			100.00%
Present value of note (as percentage)			1.03625
May 15, 2021 to May 14, 2022 | Senior Notes due 2026
Debt Instrument [Line Items]
Redemption percentage			103.625%
May 15, 2022 to May 14, 2023 | Senior Notes due 2026
Debt Instrument [Line Items]
Redemption percentage			102.417%
May 15, 2023 to May 14, 2024 | Senior Notes due 2026
Debt Instrument [Line Items]
Redemption percentage			101.208%
May 15, 2024 and thereafter | Senior Notes due 2026
Debt Instrument [Line Items]
Redemption percentage			100.00%
Redemption Period Prior To 15 July 2021 | Senior Notes due 2027
Debt Instrument [Line Items]
Redemption percentage			100.00%
Present value of note (as percentage)			1.03313
July 15, 2021 to July14, 2022 | Senior Notes due 2027
Debt Instrument [Line Items]
Redemption percentage			103.313%
July 15, 2022 to July 14, 2023 | Senior Notes due 2027
Debt Instrument [Line Items]
Redemption percentage			102.208%
July 15, 2023 to July 14, 2024 | Senior Notes due 2027
Debt Instrument [Line Items]
Redemption percentage			101.104%
July 15, 2024 and thereafter | Senior Notes due 2027
Debt Instrument [Line Items]
Redemption percentage			100.00%
Redemption Period Prior to January 15, 2021 | Senior Notes due 2028
Debt Instrument [Line Items]
Redemption percentage			105.75%
Redemption Period Prior to January 15, 2023 | Senior Notes due 2028
Debt Instrument [Line Items]
Redemption percentage			100.00%
Present value of note (as percentage)			1.02875
January 15, 2023 to January 14, 2024 | Senior Notes due 2028
Debt Instrument [Line Items]
Redemption percentage			102.875%
January 15, 2024 to January 14, 2025 | Senior Notes due 2028
Debt Instrument [Line Items]
Redemption percentage			101.917%
January 15, 2025 to January 14, 2026 | Senior Notes due 2028
Debt Instrument [Line Items]
Redemption percentage			100.958%
January 15, 2026 and thereafter | Senior Notes due 2028
Debt Instrument [Line Items]
Redemption percentage			100.00%
Redemption Period Prior to June 15, 2022 | Senior Notes due 2029
Debt Instrument [Line Items]
Redemption percentage			105.25%
Outstanding principal after redemption, percentage (at least)			50.00%
Redemption Period Prior to June 15, 2024 | Senior Notes due 2029
Debt Instrument [Line Items]
Redemption percentage			100.00%
Premium percentage of principal amount of note discount factor (as percent)			1.00%
Present value of note (as percentage)			1.02625
June 15, 2024 to June 14, 2025 | Senior Notes due 2029
Debt Instrument [Line Items]
Redemption percentage			102.625%
June 15, 2025 to June 14, 2026 | Senior Notes due 2029
Debt Instrument [Line Items]
Redemption percentage			101.75%
June 15, 2026 to June 14, 2027 | Senior Notes due 2029
Debt Instrument [Line Items]
Redemption percentage			100.875%
June 15, 2027 and thereafter | Senior Notes due 2029
Debt Instrument [Line Items]
Redemption percentage			100.00%

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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