Financing Arrangements and Derivative Financial Instruments - Notes Narrative (Details)	1 Months Ended	12 Months Ended
	May 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016	Dec. 31, 2015 USD ($)
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%
7% due 2022 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 700,000,000
Interest rate, stated percentage	7.00%			7.00%
Redemption premium payment	$ 25,000,000
Deferred financing fees write-off	$ 6,000,000
5.125% due 2023 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount		$ 1,000,000,000.0			$ 1,000,000,000
Interest rate, stated percentage		5.125%	5.125%		5.125%
Notes sold, percentage of principle amount		100.00%	100.00%
Debt redemption, potential percentage of principal amount from equity offerings		35.00%
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%
Debt redemption, potential percentage of principal amount from equity offerings		35.00%
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%
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%
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%
Period Commencing November 15, 2018 | 5.125% due 2023 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		102.563%
Period Commencing November 15, 2019 | 5.125% due 2023 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		101.281%
Period Commencing November 15, 2020 | 5.125% due 2023 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		100.00%
Period Prior to November 15, 2018 | 5.125% due 2023 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		100.00%
Debt redemption, redemption price from equity offerings		105.125%
Period Commencing December 15, 2018 | 3.75% Euro Notes due 2023 | Euro Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		101.875%
Period Commencing December 15, 2019 | 3.75% Euro Notes due 2023 | Euro Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		100.938%
Period Commencing December 15, 2020 | 3.75% Euro Notes due 2023 | Euro Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		100.00%
Period Prior to December 15, 2018 | 3.75% Euro Notes due 2023 | Euro Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		100.00%
Debt redemption, redemption price from equity offerings		103.75%
Period Commencing May 31, 2021 | 5% due 2026 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		102.50%
Period Commencing May 31, 2022 | 5% due 2026 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		101.667%
Period Commencing May 31, 2023 | 5% due 2026 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		100.833%
Period Commencing May 31, 2024 | 5% due 2026 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		100.00%
Period Prior to May 31, 2021 | 5% due 2026 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		100.00%
Debt Instrument, Redemption, Prior to December 15, 2026 | 4.875% due 2027 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		100.00%
Debt Instrument, Redemption, After December 15, 2026 | 4.875% due 2027 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		100.00%
At Any Time Plus Make Whole Premium | 8.75% due 2020 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		100.00%
At Any Time Plus Make Whole Premium | 7% due 2028 | Senior Notes
Debt Instrument [Line Items]
Debt instrument, redemption price		100.00%
Treasury Rate | 8.75% due 2020 | Senior Notes
Debt Instrument [Line Items]
Basis spread		0.50%