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Restructuring (Notes)
9 Months Ended
Sep. 30, 2020
Restructuring and Related Activities [Abstract]  
Restructuring and Related Activities Disclosure [Text Block] Restructuring CostsIn April 2020, we announced a reduction in force of 15%, which resulted in $9 million of nonrecurring expense for the nine months ended September 30, 2020. We do not expect to incur any significant additional expense in relation to the reduction in force.