Financing Arrangements and Derivative Financial Instruments - Notes Narrative (Details)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2018 EUR (€)
8.75% due 2020 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 282,000,000
Interest rate, stated percentage	8.75%	8.75%
Effective yield	9.20%	9.20%
8.75% due 2020 | Senior Notes | Treasury Rate
Debt Instrument [Line Items]
Basis spread	0.50%
8.75% due 2020 | Senior Notes | At Any Time Plus Make Whole Premium
Debt Instrument [Line Items]
Debt instrument, redemption price	100.00%
5.125% due 2023 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 1,000,000,000.0
Interest rate, stated percentage	5.125%	5.125%
Notes sold, percentage of principle amount	100.00%	100.00%
5.125% due 2023 | Senior Notes | Period Commencing November 15, 2018
Debt Instrument [Line Items]
Debt instrument, redemption price	102.563%
5.125% due 2023 | Senior Notes | Period Commencing November 15, 2019
Debt Instrument [Line Items]
Debt instrument, redemption price	101.281%
5.125% due 2023 | Senior Notes | Period Commencing November 15, 2020
Debt Instrument [Line Items]
Debt instrument, redemption price	100.00%
3.75% Euro Notes due 2023 | Euro Notes
Debt Instrument [Line Items]
Debt instrument, principal amount | €		€ 250,000,000
Interest rate, stated percentage	3.75%	3.75%
Notes sold, percentage of principle amount	100.00%	100.00%
3.75% Euro Notes due 2023 | Euro Notes | Period Commencing December 15, 2018
Debt Instrument [Line Items]
Debt instrument, redemption price	101.875%
3.75% Euro Notes due 2023 | Euro Notes | Period Commencing December 15, 2019
Debt Instrument [Line Items]
Debt instrument, redemption price	100.938%
3.75% Euro Notes due 2023 | Euro Notes | Period Commencing December 15, 2020
Debt Instrument [Line Items]
Debt instrument, redemption price	100.00%
5% due 2026 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 900,000,000
Interest rate, stated percentage	5.00%	5.00%
Notes sold, percentage of principle amount	100.00%	100.00%
Debt redemption, potential percentage of principal amount from equity offerings	35.00%
Debt redemption, redemption price from equity offerings	105.00%
5% due 2026 | Senior Notes | Period Commencing May 31, 2021
Debt Instrument [Line Items]
Debt instrument, redemption price	102.50%
5% due 2026 | Senior Notes | Period Commencing May 31, 2022
Debt Instrument [Line Items]
Debt instrument, redemption price	101.667%
5% due 2026 | Senior Notes | Period Commencing May 31, 2023
Debt Instrument [Line Items]
Debt instrument, redemption price	100.833%
5% due 2026 | Senior Notes | Period Commencing May 31, 2024
Debt Instrument [Line Items]
Debt instrument, redemption price	100.00%
5% due 2026 | Senior Notes | Period Prior to May 31, 2021
Debt Instrument [Line Items]
Debt instrument, redemption price	100.00%
4.875% due 2027 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 700,000,000
Interest rate, stated percentage	4.875%	4.875%
Basis spread	0.50%
Notes sold as a percentage of principal amount	100.00%
4.875% due 2027 | Senior Notes | Debt Instrument, Redemption, Prior to December 15, 2026
Debt Instrument [Line Items]
Debt instrument, redemption price	100.00%
4.875% due 2027 | Senior Notes | Debt Instrument, Redemption, After December 15, 2026
Debt Instrument [Line Items]
Debt instrument, redemption price	100.00%
7% due 2028 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 150,000,000
Interest rate, stated percentage	7.00%	7.00%
Basis spread	0.15%
7% due 2028 | Senior Notes | At Any Time Plus Make Whole Premium
Debt Instrument [Line Items]
Debt instrument, redemption price	100.00%