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Long-Term Debt (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2025
USD ($)
Sep. 30, 2022
Sep. 01, 2022
USD ($)
Aug. 31, 2022
USD ($)
Sep. 30, 2021
Oct. 01, 2020
USD ($)
Sep. 30, 2020
USD ($)
Apr. 30, 1998
USD ($)
Debt Instrument [Line Items]                            
Accrued interest expense   $ 1,300,000   $ 1,300,000   $ 700,000                
Credit agreement, potential increase to term loan and line of credit   300,000,000.0   300,000,000.0                    
Debt issuance costs $ 9,900,000                          
Debt issuance costs capitalized 9,600,000                          
Gain (Loss) on Extinguishment of Debt   1,500,000   1,453,000 $ 0                  
Unamortized costs 14,600,000                          
Debt issuance costs expensed   1,300,000 $ 1,349,000 2,583,000 2,744,000                  
Market value adjustments on interest rate swaps, net of tax   (21,088,000) 4,101,000 (33,294,000) 8,238,000                  
Liability for interest rate swap agreements           15,200,000                
Interest Rate Swap                            
Debt Instrument [Line Items]                            
Remaining notional balance   $ 1,400,000,000   $ 1,400,000,000                    
Derivative, average fixed interest rate   2.00%   2.00%                    
Asset for Swaps           13,300,000                
Asset for interest rate swap agreements, current           600,000                
Interest Rate Swap | Minimum                            
Debt Instrument [Line Items]                            
Derivative, average fixed interest rate   1.03%   1.03%                    
Interest Rate Swap | Maximum                            
Debt Instrument [Line Items]                            
Derivative, average fixed interest rate   2.98%   2.98%                    
Interest Rate Swap | Recurring                            
Debt Instrument [Line Items]                            
Asset for Swaps   $ 2,187,000   $ 2,187,000   13,344,000                
Derivative Liability   48,483,000   48,483,000   15,188,000                
Interest Rate Swap | Recurring | Level 2                            
Debt Instrument [Line Items]                            
Asset for Swaps   2,187,000   2,187,000   13,344,000                
Derivative Liability   48,483,000   48,483,000   $ 15,188,000                
Interest Rate Swap | Forecast                            
Debt Instrument [Line Items]                            
Remaining notional balance             $ 400,000,000.0   $ 416,000,000.0 $ 1,000,000,000.0   $ 1,200,000,000 $ 1,200,000,000  
Derivative, average fixed interest rate             2.95%     2.61%     2.18%  
Swap                            
Debt Instrument [Line Items]                            
Market value adjustments on interest rate swaps, net of tax   (21,100,000)   (33,300,000) 8,200,000                  
Deferred taxes on interest rate swaps   7,000,000.0 $ (1,400,000) 11,100,000 $ (2,700,000)                  
Credit Agreement | Minimum                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Commitment Fee Percentage           0.20%                
Credit Agreement | Maximum                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Commitment Fee Percentage           0.35%                
Line of Credit Due May 2024 | Revolving line of credit                            
Debt Instrument [Line Items]                            
Multicurrency revolving sub-facility   100,000,000.0   100,000,000.0                    
Line of Credit Due May 2024 | Letter of Credit                            
Debt Instrument [Line Items]                            
Revolving credit facility, letter of credit sub-facility   50,000,000.0   50,000,000.0                    
Term loan facility | Term Loan A-1 Due May 2024                            
Debt Instrument [Line Items]                            
Term facility, maximum borrowing capacity   1,800,000,000   $ 1,800,000,000                    
Term of loan facility       5 years                    
Line of Credit Due May 2024 | Revolving line of credit                            
Debt Instrument [Line Items]                            
Term facility, maximum borrowing capacity   750,000,000.0   $ 750,000,000.0                    
Revolving line of credit, remaining borrowing capacity   $ 740,000,000.0   $ 740,000,000.0                    
Senior notes | 7.55% senior debentures due April 2028                            
Debt Instrument [Line Items]                            
Debt instrument, face amount                           $ 100,000,000.0
Line of Credit | Minimum                            
Debt Instrument [Line Items]                            
Debt Instrument, Debt Restrictive Covenants, Interest Coverage Ratio   3.00   3.00                    
Line of Credit | Maximum                            
Debt Instrument [Line Items]                            
Debt Instrument, Debt Restrictive Covenants, Leverage Ratio   4.50   4.50                    
Line of Credit | Forecast                            
Debt Instrument [Line Items]                            
Debt Instrument, Debt Restrictive Covenants, Leverage Ratio               3.75     4.00   4.25  
Debt Instrument, Redemption, Period One [Member] | Term loan facility | Term Loan A-1 Due May 2024                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Periodic Payment $ 21,900,000                          
Federal Funds Effective Rate Plus [Member] | Credit Agreement                            
Debt Instrument [Line Items]                            
Debt Instrument, Basis Spread on Variable Rate           0.50%                
Adjusted LIBO Plus [Member] | Credit Agreement                            
Debt Instrument [Line Items]                            
Debt Instrument, Basis Spread on Variable Rate           1.00%                
Alternate Base Rate [Member] | Credit Agreement                            
Debt Instrument [Line Items]                            
Debt Instrument, Basis Spread on Variable Rate           0.75%                
Alternate Base Rate [Member] | Credit Agreement | Minimum                            
Debt Instrument [Line Items]                            
Debt Instrument, Basis Spread on Variable Rate           0.25%                
Alternate Base Rate [Member] | Credit Agreement | Maximum                            
Debt Instrument [Line Items]                            
Debt Instrument, Basis Spread on Variable Rate           1.00%                
Adjusted LIBO [Member] | Credit Agreement                            
Debt Instrument [Line Items]                            
Debt Instrument, Basis Spread on Variable Rate           1.75%                
Adjusted LIBO [Member] | Credit Agreement | Minimum                            
Debt Instrument [Line Items]                            
Debt Instrument, Basis Spread on Variable Rate           1.25%                
Adjusted LIBO [Member] | Credit Agreement | Maximum                            
Debt Instrument [Line Items]                            
Debt Instrument, Basis Spread on Variable Rate           2.00%