Commitments and Contingencies Purchase Commitments (Details)	12 Months Ended
Dec. 31, 2018
Long-term Purchase Commitment [Line Items]
Long-term Purchase Commitment, Description	December 2019
Maximum [Member]
Long-term Purchase Commitment [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	90.60%
Minimum [Member]
Long-term Purchase Commitment [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	25.60%

Describes the terms of a significant arrangement with a supplier (excluding an unconditional purchase obligation) to acquire goods or services over a period of time beyond one year or the normal operating cycle, if longer, which may include identification of the goods or services to be purchased, pricing, effects on pricing of failing to reach minimum quantities required to be purchased, cancellation rights, and termination provisions.

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration