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Debt Obligations (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
May 28, 2019
Mar. 18, 2019
Oct. 17, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Sep. 04, 2019
May 22, 2019
Debt Instrument [Line Items]                    
Senior notes       $ 703.2   $ 703.2        
Conversion price   $ 188.73                
Debt instrument, convertible, carrying amount of equity component       99.7   99.7        
Interest expense, debt         $ 1.5          
Debt instrument, interest rate during period 100.00% 100.00%                
Line of credit facility, expiration date     Oct. 17, 2023              
Line of credit, current       0.9   $ 0.9   $ 6.2    
London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, applicable margin           0.65%        
Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity       200.0   $ 200.0        
Due 2049 [Member]                    
Debt Instrument [Line Items]                    
Sale of convertible senior notes   $ 525.0                
Interest expense, debt       1.0 1.0 3.0 $ 2.1      
Amortization of debt discount (premium)       $ 3.8 $ 3.7 $ 11.4 7.9      
Debt instrument, interest rate during period       4.40%   4.40%        
Debt instrument, unamortized discount       $ 76.7   $ 76.7        
Due 2044 [Member]                    
Debt Instrument [Line Items]                    
Amortization of debt discount (premium)             $ 4.6      
Debt instrument, interest rate during period 1.50%                  
Senior Notes, 1.375 Percent due 2026 [Member]                    
Debt Instrument [Line Items]                    
Senior notes                   $ 669.9
Long-term debt, percentage bearing fixed interest, percentage rate       1.375%   1.375%        
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, applicable margin           1.125%        
Minimum [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, applicable margin           0.175%        
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, applicable margin           2.00%        
Maximum [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, applicable margin           1.00%        
Swingline loans [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity       $ 50.0   $ 50.0        
Foreign Swingline Loans [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity       90.0   90.0        
Unsecured Debt [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity     $ 1,000.0           $ 100.0  
Euro Member Countries, Euro                    
Debt Instrument [Line Items]                    
Senior notes       $ 600.0   $ 600.0        
Euro Member Countries, Euro | Senior Notes, 1.375 Percent due 2026 [Member]                    
Debt Instrument [Line Items]                    
Senior notes                   $ 600.0