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Debt and Credit Arrangements - Summary of Outstanding Borrowings (Details) - USD ($)
Dec. 31, 2019
Jun. 14, 2019
Dec. 31, 2018
Nov. 06, 2017
Debt Instrument        
Total $ 829,400,000      
Total debt, net of unamortized discount and debt issuance costs 777,300,000   $ 544,400,000  
Less: current maturities 15,700,000   11,200,000  
Less: current portion of unamortized debt issuance costs 600,000   0  
Long-term debt 761,000,000.0   533,200,000  
Current maturities 15,700,000      
Convertible Notes, due 2024 | Convertible Debt        
Debt Instrument        
Unamortized debt issuance costs (3,800,000)   (4,500,000)  
Principal amount 258,800,000   258,800,000 $ 258,800,000
Unamortized discount (42,800,000)   (50,400,000)  
Convertible notes, net of unamortized discount and debt issuance costs $ 212,200,000   203,900,000  
Debt instrument stated interest rate (percent) 1.00%     1.00%
Foreign facilities        
Debt Instrument        
Foreign facilities $ 4,400,000   11,200,000  
Current maturities 4,400,000      
Revolving Credit Facility        
Debt Instrument        
Total     329,300,000  
Revolving Credit Facility | Credit Facilities 2019        
Debt Instrument        
Unamortized debt issuance costs (5,500,000)      
Total 560,700,000      
Revolving Credit Facility | Term long due June 2024        
Debt Instrument        
Long-term debt, gross $ 447,200,000      
Debt instrument stated interest rate (percent) 3.99%      
Debt instrument percentage of principal due annually, through year two (percent) 2.50%      
Debt instrument percentage of principal due annually, year three (percent) 5.00%      
Debt instrument percentage of principal due annually, year four (percent) 7.50%      
Debt instrument percentage of principal due annually, year three (percent) 10.00%      
Maximum borrowing capacity   $ 450,000,000.0    
Revolving Credit Facility | Senior secured revolving credit facility due June 2024        
Debt Instrument        
Long-term debt, gross $ 119,000,000.0      
Unamortized debt issuance costs $ (9,500,000)      
Maximum borrowing capacity   $ 550,000,000.0    
Debt instrument weighted average interest rate (percent) 2.57%      
Revolving Credit Facility | Senior secured revolving credit facility due November 2022        
Debt Instrument        
Long-term debt, gross     $ 329,300,000  
Unamortized debt issuance costs $ (2,500,000)      
Letter of credit outstanding 71,500,000      
Line of credit remaining borrowing amount $ 359,500,000      
Revolving Credit Facility | Foreign facilities        
Debt Instrument        
Debt instrument weighted average interest rate (percent) 1.30%   4.80%  
Letter of credit outstanding $ 12,600,000   $ 17,100,000  
Line of credit remaining borrowing amount 23,100,000   $ 65,600,000  
Revolving Credit Facility Sub-limit - Letters of Credit | Senior secured revolving credit facility due June 2024        
Debt Instrument        
Maximum borrowing capacity 100,000,000.0      
Revolving Credit Facility Sub-limit - Discretionary Letters of Credit | Senior secured revolving credit facility due June 2024        
Debt Instrument        
Maximum borrowing capacity 250,000,000.0      
Revolving Credit Facility Sub-limit - Swingline | Senior secured revolving credit facility due June 2024        
Debt Instrument        
Maximum borrowing capacity $ 50,000,000.0