XML 88 R57.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Debt - Industrial Revenue Bonds (Details)
Dec. 31, 2019
Maximum [Member] | Short-term Debt [Member] | Industrial revenue bonds due 2028 [Member]  
Short-term Debt [Line Items]  
Effective interest rate (percent) 12.00%