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Debt - Other (Details)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2016
USD ($)
Apr. 12, 2013
USD ($)
Nov. 20, 2006
USD ($)
tranche
Sep. 30, 2016
USD ($)
Mar. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Nov. 15, 2016
USD ($)
Debt              
Total         $ 1,844.2 $ 1,596.3  
Number of financial covenants | item         2    
Credit Agreement              
Debt              
Maximum borrowing capacity $ 2,100.0     $ 2,100.0      
Debt term 5 years            
Unsecured revolving credit facility due September 30, 2021              
Debt              
Maximum borrowing capacity $ 1,500.0     1,500.0      
Total         $ 631.0 $ 368.0  
Additional maximum borrowing capacity under the credit agreement subject to approval of the lenders and certain other conditions 500.0     500.0      
Commitment fee on unused portion of revolving credit facility (as a percent)         0.125%    
Weighted average fixed interest rate (as a percent)         2.14% 3.69%  
Letters of credit outstanding         $ 37.5    
Available on the revolving credit facility         $ 831.5    
Unsecured revolving credit facility due September 30, 2021 | LIBOR              
Debt              
Variable interest rate         LIBOR    
Interest rate added to base (as a percent)         1.00%    
Unsecured revolving credit facility due September 30, 2021 | Bank prime rate              
Debt              
Variable interest rate         bank prime rate    
Unsecured term loan due from June 30, 2020 to September 30, 2021              
Debt              
Maximum borrowing capacity $ 600.0     $ 600.0      
Total         $ 450.0 $ 465.0  
Annual amortization of term loan thereafter until June 2021 (as a percent)       10.00%      
Weighted average fixed interest rate (as a percent)         1.99% 2.80%  
Senior Unsecured Notes              
Debt              
Percentage of principal amount at which the notes may be required to be repurchased in event of a change of control and a downgrade of the entity's credit rating         101.00%    
Senior unsecured notes issued November 20, 2006              
Debt              
Issuance of debt     $ 600.0        
Number of tranches comprising the debt issuance | tranche     2        
Senior unsecured notes due November 15, 2016              
Debt              
Total             $ 0.0
Interest rate (as a percent)     6.20%        
Lump sum payment on maturity             $ 350.0
Issuance of debt     $ 350.0        
Senior unsecured notes due April 15, 2023              
Debt              
Total         $ 500.0 $ 500.0  
Interest rate (as a percent)   4.50%          
Issuance of debt   $ 500.0          
Senior unsecured notes due November 15, 2036              
Debt              
Total         250.0 250.0  
Interest rate (as a percent)     6.85%        
Issuance of debt     $ 250.0        
Other notes and revolving credit facilities              
Debt              
Maximum borrowing capacity         7.7    
Total         4.2 4.3  
IRB              
Debt              
Total         $ 9.0 $ 9.0