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Debt (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 03, 2019
Sep. 30, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Unamortized debt financing costs wrote off     $ 2,700,000    
Letter of Credit [Member]          
Debt Instrument [Line Items]          
Credit facility amount   $ 47,700,000 47,700,000    
Line of credit availability   208,700,000 208,700,000    
Interest Rate Swap Contracts [Member]          
Debt Instrument [Line Items]          
Notional interest rate swap   100,000,000.0 100,000,000.0    
Term Loan B [Member]          
Debt Instrument [Line Items]          
Voluntary prepayment of debt outstanding $ 100,000,000.0        
Line of credit availability       $ 241,900,000  
Term Loan A [Member]          
Debt Instrument [Line Items]          
Line of credit availability   500,000,000.0 $ 500,000,000.0 525,000,000.0  
Maturity date     Apr. 30, 2021    
Term Loan A [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Interest rate spread     1.75%    
Bi-lateral Facility [Member] | Letter of Credit [Member]          
Debt Instrument [Line Items]          
Credit facility amount   11,500,000 $ 11,500,000    
Line of credit availability   25,000,000.0 25,000,000.0    
Tax-Exempt Industrial Development Bond [Member]          
Debt Instrument [Line Items]          
Long-term debt outstanding   35,000,000.0 35,000,000.0   $ 35,000,000.0
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of credit availability   1,000,000,000.0 1,000,000,000.0    
Amount outstanding   120,000,000.0 120,000,000.0 0 0
Letter of credit maximum sublimit   150,000,000 $ 150,000,000    
Maturity date     Apr. 30, 2021    
Revolving Credit Facility [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Interest rate spread     2.00%    
Securitization Facility [Member]          
Debt Instrument [Line Items]          
Credit facility amount   36,200,000 $ 36,200,000    
Maturity date     Mar. 31, 2020    
Securitization Facility [Member] | ARC [Member]          
Debt Instrument [Line Items]          
Ownership interest     100.00%    
Securitization Facility [Member] | Letter of Credit [Member]          
Debt Instrument [Line Items]          
Credit facility amount   36,200,000 $ 36,200,000    
Line of credit availability   33,700,000 33,700,000    
Letters of credit issued classified as restricted cash   2,500,000 2,500,000   $ 6,000,000.0
Senior Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit facility amount   1,050,000,000.0 1,050,000,000.0 $ 1,050,000,000.0  
Amended Senior Credit Facility [Member]          
Debt Instrument [Line Items]          
Bank, legal and other fees   3,000,000.0 3,000,000.0    
Amount capitalized and recorded as a component of long-term debt   2,900,000 2,900,000    
Unamortized debt financing costs wrote off   2,700,000 $ 2,700,000    
Amended Senior Credit Facility [Member] | Term Loan A [Member]          
Debt Instrument [Line Items]          
Maturity date     Sep. 30, 2024    
Amended Senior Credit Facility [Member] | Term Loan A [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Interest rate spread     1.50%    
Amended Senior Credit Facility [Member] | Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of credit availability   500,000,000.0 $ 500,000,000.0    
Letter of credit maximum sublimit   $ 150,000,000.0 $ 150,000,000.0    
Maturity date     Sep. 30, 2024    
Amended Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Interest rate spread     1.50%