Financing Arrangements and Derivative Financial Instruments - Long Term Debt and Finance Leases, Net of Unamortized Discounts, and Interest Rates (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Aug. 16, 2020	May 18, 2020	Dec. 31, 2019
Long-term Debt and Lease Obligation [Abstract]
Non-cash financing additions	$ 3
8.75% Due 2020 | Senior Notes
Long-term Debt and Lease Obligation [Abstract]
Interest rate, stated percentage	8.75%	8.75%		8.75%
5.125% due 2023 | Senior Notes
Long-term Debt and Lease Obligation [Abstract]
Interest rate, stated percentage	5.125%			5.125%
3.75% Euro Notes due 2023 | Senior Notes
Long-term Debt and Lease Obligation [Abstract]
Interest rate, stated percentage	3.75%
3.75% Euro Notes due 2023 | Euro Notes
Long-term Debt and Lease Obligation [Abstract]
Interest rate, stated percentage	3.75%			3.75%
9.5% due 2025 | Senior Notes
Long-term Debt and Lease Obligation [Abstract]
Interest rate, stated percentage	9.50%		9.50%	9.50%
5% due 2026 | Senior Notes
Long-term Debt and Lease Obligation [Abstract]
Interest rate, stated percentage	5.00%			5.00%
4.875% due 2027 | Senior Notes
Long-term Debt and Lease Obligation [Abstract]
Interest rate, stated percentage	4.875%			4.875%
7% due 2028 | Senior Notes
Long-term Debt and Lease Obligation [Abstract]
Interest rate, stated percentage	7.00%			7.00%