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Revenue Recognition (Volume Commitment Programs) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Volume commitment programs
Disaggregation of Revenue [Line Items]
Commitment contract assets	$ 134.7	$ 134.7	$ 115.5
Commitment contract assets reclassified to accounts receivable	6.7	13.6
Up front customer loyalty programs and volume commitment programs
Disaggregation of Revenue [Line Items]
Estimation of future revenues	$ 2,500.0	$ 2,500.0

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