Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Derivative Instruments - Narrative (Details) - USD ($)	12 Months Ended
Derivative Instruments - Narrative (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Aug. 31, 2016	Aug. 25, 2016	Dec. 31, 2015	Jun. 04, 2015
Derivative [Line Items]
Net cash used by investing activities related to foreign currency contracts	$ (8,000,000)	$ 0	$ (8,000,000)
6.125% Senior Notes due 2023
Derivative [Line Items]
Interest rate, stated percentage					6.125%
6.50% Senior Notes due 2022
Derivative [Line Items]
Interest rate, stated percentage							6.50%
Senior Notes \| 6.125% Senior Notes due 2023
Derivative [Line Items]
Interest rate, stated percentage				6.125%
Senior Notes \| 6.50% Senior Notes due 2022
Derivative [Line Items]
Interest rate, stated percentage						6.50%
Senior Notes \| 5.75% Senior Notes due 2021
Derivative [Line Items]
Interest rate, stated percentage							5.75%
Cross-currency swap agreements \| Derivatives designated as hedges: \| Net Investment Hedge
Derivative [Line Items]
Nonderivatives designated as hedges, notional amount	0	$ 0
Foreign currency forward contracts
Derivative [Line Items]
Net cash used by investing activities related to foreign currency contracts	$ 21,000,000
Foreign currency forward contracts \| Derivatives not designated as hedges: \| Maximum
Derivative [Line Items]
Derivative, term of contract	12 months