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Long-term Debt Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Amortization of financing costs and discounts $ 2.0 $ 1.0 $ 1.0
Long-term Debt, Gross 351.0 $ 356.0  
Line of Credit Facility, Remaining Borrowing Capacity 350.0    
Line of Credit Capacity, Sublimit for Letters of Credit $ 60.0    
Capitalization Ratio, Maximum 50.00%    
Debt, weighted average interest rate   4.90%  
Chilean term credit facility, maturing 2019 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 0.0 $ 5.0  
Senior unsecured notes, maturing 2024 [Member]      
Debt Instrument [Line Items]      
Fair value of debt 362.0 338.0  
Amount of loan issuance 350.0    
Long-term Debt, Gross $ 350.0 $ 350.0  
Debt, interest rate, stated percentage 4.875%    
Base Rate      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate During Period 0.50%    
Base Rate | Maximum      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate During Period 2.00%    
Base Rate | Minimum      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate During Period 0.875%    
London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate During Period 1.00%    
London Interbank Offered Rate (LIBOR) | Maximum      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate During Period 3.00%    
London Interbank Offered Rate (LIBOR) | Minimum      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate During Period 1.875%    
Other Commitments [Domain] | Maximum      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate During Period 0.60%    
Other Commitments [Domain] | Minimum      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate During Period 0.30%