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Revenue Recognition (Volume Commitment Programs) (Details) - Volume commitment programs - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Jan. 01, 2018
Disaggregation of Revenue [Line Items]      
Commitment contract assets $ 29.0 $ 29.0 $ 5.6
Commitment contract assets reclassified to accounts receivable $ 1.0 $ 3.4