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Debt - Credit Agreements (Details)
SFr in Millions, $ in Millions
12 Months Ended
Dec. 11, 2019
USD ($)
Oct. 27, 2015
USD ($)
Dec. 31, 2020
Dec. 31, 2019
USD ($)
Dec. 11, 2019
CHF (SFr)
Jan. 31, 2012
USD ($)
Revolving lines of credit            
Maximum commitment       $ 732.9    
Adjusted LIBOR            
Revolving lines of credit            
Interest rate added to base rate (as a percent)     1.00%      
2019 Credit Agreement            
Revolving lines of credit            
Maximum commitment $ 600.0          
Revolving credit facility term 5 years          
Incremental facility $ 250.0          
Maximum Leverage Ratio     3.5      
Minimum coverage ratio     2.5      
2019 Credit Agreement | Minimum            
Revolving lines of credit            
Facility fee (as a percent)     0.10%      
2019 Credit Agreement | Maximum            
Revolving lines of credit            
Facility fee (as a percent)     0.20%      
2019 Credit Agreement | Greatest of prime rate, federal funds rate plus spread and adjusted LIBOR plus spread | Minimum            
Revolving lines of credit            
Interest rate added to base rate (as a percent)     0.10%      
2019 Credit Agreement | Greatest of prime rate, federal funds rate plus spread and adjusted LIBOR plus spread | Maximum            
Revolving lines of credit            
Interest rate added to base rate (as a percent)     0.50%      
2019 Credit Agreement | Prime rate            
Revolving lines of credit            
Variable interest rate base     prime rate      
2019 Credit Agreement | Federal Funds            
Revolving lines of credit            
Variable interest rate base     federal funds effective rate      
Interest rate added to base rate (as a percent)     0.50%      
2019 Credit Agreement | Adjusted LIBOR            
Revolving lines of credit            
Variable interest rate base     adjusted LIBOR      
2019 Credit Agreement | LIBOR            
Revolving lines of credit            
Variable interest rate base     LIBOR      
2019 Credit Agreement | LIBOR | Minimum            
Revolving lines of credit            
Interest rate added to base rate (as a percent)     1.00%      
2019 Credit Agreement | LIBOR | Maximum            
Revolving lines of credit            
Interest rate added to base rate (as a percent)     1.50%      
2019 Term Loan            
Revolving lines of credit            
Maximum commitment $ 300.0          
Revolving credit facility term 7 years          
2019 Term Loan | Prime rate            
Revolving lines of credit            
Variable interest rate base prime rate          
2019 Term Loan | Federal Funds            
Revolving lines of credit            
Interest rate added to base rate (as a percent) 0.50%          
2019 Note Purchase Agreement            
Revolving lines of credit            
Interest rate added to base rate (as a percent) 1.01%          
Additional aggregate principal amount that may be issued | SFr         SFr 297  
2015 Revolving Credit Agreement            
Revolving lines of credit            
Maximum commitment   $ 500.0        
Revolving credit facility term   5 years        
4.31% Series 2012A Senior Notes, Tranche C, due January 18, 2022            
Revolving lines of credit            
Facility fee (as a percent)   4.31%        
Senior notes   $ 105.0       $ 105.0
4.46% Series 2012A Senior Notes, Tranche D, due January 18, 2024            
Revolving lines of credit            
Facility fee (as a percent)   4.46%        
Senior notes   $ 100.0       $ 100.0