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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Schedule of Liabilities Subject to Compromise (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Aug. 18, 2020	Mar. 31, 2020
Debt Instrument [Line Items]
Accrued Interest on Senior Notes, Exchangeable Senior Notes, Debentures and Revolving Credit Facility	$ 203.5	$ 203.5
Rig holding costs(1)	13.9	13.9
Liabilities Subject to Compromise	7,313.7	7,313.7		$ 7,313.7
Senior Notes | 6.875% Senior notes due 2020
Debt Instrument [Line Items]
Long-term debt	122.9	122.9
Interest rate on borrowings outstanding			6.875%
Senior Notes | 4.70% Senior notes due 2021
Debt Instrument [Line Items]
Long-term debt	100.7	100.7
Interest rate on borrowings outstanding			4.70%
Senior Notes | 4.875% Senior notes due 2022
Debt Instrument [Line Items]
Long-term debt	620.8	620.8
Interest rate on borrowings outstanding			4.875%
Senior Notes | 3.00% Exchangeable senior notes due 2024
Debt Instrument [Line Items]
Long-term debt	849.5	849.5
Interest rate on borrowings outstanding			3.00%
Senior Notes | 4.50% Senior notes due 2024
Debt Instrument [Line Items]
Long-term debt	303.4	303.4
Interest rate on borrowings outstanding			4.50%
Senior Notes | 4.75% Senior notes due 2024
Debt Instrument [Line Items]
Long-term debt	318.6	318.6
Interest rate on borrowings outstanding			4.75%
Senior Notes | 8.00% Senior notes due 2024
Debt Instrument [Line Items]
Long-term debt	292.3	292.3
Interest rate on borrowings outstanding			8.00%
Senior Notes | 5.20% Senior notes due 2025
Debt Instrument [Line Items]
Long-term debt	333.7	333.7
Interest rate on borrowings outstanding			5.20%
Senior Notes | 7.375% Senior notes due 2025
Debt Instrument [Line Items]
Long-term debt	360.8	360.8
Interest rate on borrowings outstanding			7.375%
Senior Notes | 7.75% Senior notes due 2026
Debt Instrument [Line Items]
Long-term debt	1,000.0	1,000.0
Interest rate on borrowings outstanding			7.75%
Senior Notes | 7.20% Debentures due 2027
Debt Instrument [Line Items]
Long-term debt	112.1	112.1
Interest rate on borrowings outstanding			7.20%
Senior Notes | 7.875% Senior notes due 2040
Debt Instrument [Line Items]
Long-term debt	300.0	300.0
Interest rate on borrowings outstanding			7.875%
Senior Notes | 5.40% Senior notes due 2042
Debt Instrument [Line Items]
Long-term debt	400.0	400.0
Interest rate on borrowings outstanding			5.40%
Senior Notes | 5.75% Senior notes due 2044
Debt Instrument [Line Items]
Long-term debt	1,000.5	1,000.5
Interest rate on borrowings outstanding			5.75%
Senior Notes | 5.85% Senior notes due 2044
Debt Instrument [Line Items]
Long-term debt	400.0	400.0
Interest rate on borrowings outstanding			5.85%
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 581.0	$ 581.0

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