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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis The carrying amounts and estimated fair values of our financial instruments are as follows:
 December 31,
 20202019
 CarryingFairCarryingFair
(in millions)AmountValueAmountValue
Cash and cash equivalents$574.0 $574.0 $519.1 $519.1 
Accounts receivable881.1 881.1 803.9 803.9 
Accounts payable769.1 769.1 680.4 680.4 
Structured accounts payable arrangements640.0 640.0 740.6 740.6 
Short-term debt0.1 0.1 41.6 41.6 
Long-term debt, including current portion4,578.0 5,172.1 4,572.7 4,920.9