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Debt - Credit Facility Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 19, 2020
Mar. 31, 2022
Sep. 30, 2020
Dec. 31, 2021
Oct. 18, 2019
Debt Instrument [Line Items]          
Debt instrument, face amount         $ 1,200,000,000
Line of credit facility, maximum borrowing capacity         500,000,000
Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity   $ 500,000,000   $ 500,000,000  
Letters of credit outstanding, amount   64,319,000   64,374,000  
Line of credit facility, remaining borrowing capacity   $ 235,700,000      
London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis   the LIBOR rate      
EURIBOR [Member]          
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis   EURIBOR rate      
Alternate base rate [Member]          
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis   Alternate Base Rate      
Alternate base rate (1) [Member]          
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis   the prime rate      
Alternate base rate (2) [Member]          
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis   the Federal Reserve effective rate      
Fed Funds Effective Rate Overnight Index Swap Rate [Member]          
Debt Instrument [Line Items]          
Debt instrument, basis spread on variable rate   0.50%      
Alternate base rate (3) [Member]          
Debt Instrument [Line Items]          
Debt instrument, description of variable rate basis   one-month LIBOR      
Debt instrument, basis spread on variable rate   1.00%      
Minimum          
Debt Instrument [Line Items]          
Line of credit facility, unused capacity, commitment fee percentage     0.15%    
Debt Instrument, Interest Rate, Effective Percentage     1.00%    
Maximum          
Debt Instrument [Line Items]          
Line of credit facility, unused capacity, commitment fee percentage     0.25%    
Debt Instrument, Interest Rate, Effective Percentage     1.75%    
USD Denominated Term Loan [Member]          
Debt Instrument [Line Items]          
Debt instrument, face amount         650,000,000
Standby Letters of Credit [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity         300,000,000
Letters of credit outstanding, amount   $ 64,300,000      
Swingline sub-facility [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity         $ 50,000,000
Multicurrency revolving line of credit   0      
Line of Credit          
Debt Instrument [Line Items]          
Debt instrument, fee amount $ 1,400,000        
Multicurrency revolving line of credit   0   0  
Line of credit facility, remaining borrowing capacity   $ 435,681,000   $ 435,626,000  
Line of Credit | Fourth Quarter 2020          
Debt Instrument [Line Items]          
Debt instrument, debt covenant. required rate 4.75        
Line of Credit | First Quarter 2021          
Debt Instrument [Line Items]          
Debt instrument, debt covenant. required rate 4.50        
Line of Credit | Minimum          
Debt Instrument [Line Items]          
Line of credit facility, unused capacity, commitment fee percentage 0.15%        
Debt Instrument, Interest Rate, Effective Percentage 1.00%        
Line of Credit | Maximum          
Debt Instrument [Line Items]          
Line of credit facility, unused capacity, commitment fee percentage 0.30%        
Debt Instrument, Interest Rate, Effective Percentage 2.00%        
Secured Debt          
Debt Instrument [Line Items]          
Debt instrument, collateral   All obligations under the 2018 credit facility are guaranteed by Itron, Inc. and material U.S. domestic subsidiaries and are secured by a pledge of substantially all of the assets of Itron, Inc. and material U.S. domestic subsidiaries. This includes a pledge of 100% of the capital stock of material U.S. domestic subsidiaries and up to 66% of the voting stock (100% of the non-voting stock) of first-tier foreign subsidiaries. In addition, the obligations of any foreign subsidiary who is a foreign borrower, as defined by the 2018 credit facility, are guaranteed by the foreign subsidiary and by its direct and indirect foreign parents.