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Debt (Senior Secured Credit Facility) (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 19, 2019
Dec. 31, 2018
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2019
Debt Instrument [Line Items]            
Line of credit facility, letters of credit issued $ 142.4   $ 128.4     $ 142.4
Credit Facility [Member]            
Debt Instrument [Line Items]            
Line of credit facility, maturity date           Sep. 19, 2024
Line of credit facility, maximum borrowing capacity   $ 1,750.0 $ 1,500.0      
Line of credit, revolving loan sublimit, canadian dollars or mexican pesos $ 300.0         $ 300.0
Line of credit facility, unused facility fee (percentage) 0.225%   0.35%      
Line of credit facility, letters of credit issued $ 102.2   $ 88.2     $ 102.2
Credit Facility [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Line of credit facility, unused facility fee (percentage)   0.20% 0.20%      
Percentage of consolidated EBITDA threshold, combined subsidiary guarantors 15.00%         15.00%
Consolidated interest coverage ratio 3.00         3.00
Credit Facility [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Line of credit facility, unused facility fee (percentage)   0.30% 0.40%      
Percentage of consolidated EBITDA threshold, combined subsidiary guarantors 80.00%         80.00%
Maximum consolidated leverage ratio 3.50         3.50
Credit Facility [Member] | Eurocurrency Rate [Member]            
Debt Instrument [Line Items]            
Base rate option three, debt instrument, basis spread on variable rate   1.00%        
Credit Facility [Member] | Eurocurrency Rate [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Line of credit facility, interest rate description   1.25% 1.25%      
Credit Facility [Member] | Eurocurrency Rate [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Line of credit facility, interest rate description   1.75% 2.00%      
Credit Facility [Member] | Base Rate [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Line of credit facility, interest rate description   0.25% 0.25%      
Credit Facility [Member] | Base Rate [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Line of credit facility, interest rate description   0.75% 1.00%      
Credit Facility [Member] | Federal Funds Rate [Member]            
Debt Instrument [Line Items]            
Base rate option one, debt instrument, basis spread on variable rate   0.50%        
Credit Facility [Member] | Plan [Member]            
Debt Instrument [Line Items]            
Permitted acquisitions amount           $ 100.0
Credit Facility [Member] | Plan [Member] | Maximum [Member] | Permitted Acquisition [Member]            
Debt Instrument [Line Items]            
Maximum consolidated leverage ratio 4.00         4.00
Number of fiscal quarters subsequent to quarter in which right was exercised 4         4
Number of times right may be exercised 2         2
Credit Facility [Member] | Revolving Loans [Member]            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity   $ 1,350.0        
Long-term debt obligations $ 251.1   $ 456.9     $ 251.1
Line of credit facility, amount of borrowings denominated in foreign currencies 116.0   128.0     116.0
Line of credit facility, remaining borrowing capacity 996.7   554.9     996.7
Line of credit facility, remaining borrowing capacity available in either Canadian dollars or Mexican pesos $ 183.9   $ 91.9     $ 183.9
Credit Facility [Member] | Revolving Loans [Member] | Weighted Average [Member]            
Debt Instrument [Line Items]            
Line of credit facility, interest rate (percentage) 3.417%   4.234%     3.417%
Credit Facility [Member] | Term Loan [Member]            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity   400.0        
Long-term debt obligations $ 400.0 $ 400.0 $ 376.9     $ 400.0
Line of credit facility, interest rate (percentage) 3.419%   4.272%     3.419%
Credit Facility [Member] | Term Loan [Member] | Forecast [Member]            
Debt Instrument [Line Items]            
Line of credit facility, term loan, amount of quarterly principal installment payments       $ 5.0 $ 2.5  
Credit Facility [Member] | Swing Line Loans [Member]            
Debt Instrument [Line Items]            
Line of credit, revolving loan sublimit $ 125.0         $ 125.0
Credit Facility [Member] | Letters of Credit [Member]            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity 650.0         650.0
Line of credit, letter of credit sublimit, canadian dollars or mexican pesos 200.0         200.0
Line of credit facility, capacity available for letters of credit $ 547.8   $ 554.9     $ 547.8
Credit Facility [Member] | Letters of Credit [Member] | Commercial and/or Financial Standby [Member]            
Debt Instrument [Line Items]            
Line of credit facility, interest rate (percentage) 1.375%   1.75%     1.375%
Credit Facility [Member] | Letters of Credit [Member] | Performance Standby [Member]            
Debt Instrument [Line Items]            
Line of credit facility, interest rate (percentage) 0.50%   0.875%     0.50%
Credit Facility [Member] | Letters of Credit [Member] | Minimum [Member] | Commercial and/or Financial Standby [Member]            
Debt Instrument [Line Items]            
Line of credit facility, interest rate (percentage)   1.25% 1.25%      
Credit Facility [Member] | Letters of Credit [Member] | Minimum [Member] | Performance Standby [Member]            
Debt Instrument [Line Items]            
Line of credit facility, interest rate (percentage)   0.375% 0.50%      
Credit Facility [Member] | Letters of Credit [Member] | Maximum [Member] | Commercial and/or Financial Standby [Member]            
Debt Instrument [Line Items]            
Line of credit facility, interest rate (percentage)   1.75% 2.00%      
Credit Facility [Member] | Letters of Credit [Member] | Maximum [Member] | Performance Standby [Member]            
Debt Instrument [Line Items]            
Line of credit facility, interest rate (percentage)   0.75% 1.00%