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Debt - Components of Debt (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
extension
Dec. 31, 2019
USD ($)
Jan. 22, 2020
Dec. 05, 2019
Debt Instrument [Line Items]        
Deferred financing costs $ (33.8) $ (25.8)    
Total $ 3,047.0 2,886.6    
LIBOR        
Debt Instrument [Line Items]        
Stated interest rate 1.00%      
GPB LIBOR        
Debt Instrument [Line Items]        
Stated interest rate 0.25%      
Term Loan | 2023 Term Loan        
Debt Instrument [Line Items]        
Credit facility $ 0.0 800.0    
Term Loan | 2025 Term Loan        
Debt Instrument [Line Items]        
Credit facility $ 0.0 $ 300.0    
Term Loan | LIBOR | 2023 Term Loan Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.20%      
Term Loan | LIBOR | 2025 Term Loan Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.20%      
Term Loan | LIBOR | 2023 Term Loan        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.35%    
Term Loan | LIBOR | 2025 Term Loan        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.65%    
Senior Notes | 2024 Notes, including bond discount of $0.8 million        
Debt Instrument [Line Items]        
Long-term debt $ 599.2 $ 599.2    
Stated interest rate 2.90%     2.90%
Bond premium $ 0.8      
Senior Notes | 2029 Notes, including bond discount of $1.7 million        
Debt Instrument [Line Items]        
Long-term debt $ 598.3 598.2    
Stated interest rate 3.45%     3.45%
Bond premium $ 1.7      
Senior Notes | 2027 Notes, including bond discount of $0.7 million        
Debt Instrument [Line Items]        
Long-term debt $ 549.3 0.0    
Stated interest rate 1.45%   1.45%  
Bond premium $ 0.7      
Revolving Credit Facility | 1.4 Billion Senior Multi Currency Revolving Credit Facility        
Debt Instrument [Line Items]        
Number of extension options | extension 1      
Term of extension option 12 months      
Revolving Credit Facility | 1.4 Billion US Revolving Credit Facility        
Debt Instrument [Line Items]        
Credit facility $ 203.0      
Revolving Credit Facility | 1.4 Billion EUR Revolving Credit Facility        
Debt Instrument [Line Items]        
Credit facility 0.0      
Revolving Credit Facility | 1.4 Billion GBP Revolving Credit Facility        
Debt Instrument [Line Items]        
Credit facility 31.0      
Revolving Credit Facility | 2023 Term Loan Facility        
Debt Instrument [Line Items]        
Credit facility $ 400.0      
Number of extension options | extension 2      
Term of extension option 1 year      
Revolving Credit Facility | 2025 Term Loan Facility        
Debt Instrument [Line Items]        
Credit facility $ 700.0      
Revolving Credit Facility | $3 Billion Credit Facility        
Debt Instrument [Line Items]        
Credit facility 1,300.0      
Revolving Credit Facility | $1.7 Billion Revolving Credit Facility:        
Debt Instrument [Line Items]        
Credit facility 234.0      
Revolving Credit Facility | US Revolver        
Debt Instrument [Line Items]        
Credit facility 0.0 555.0    
Revolving Credit Facility | EUR Revolver        
Debt Instrument [Line Items]        
Credit facility 0.0 33.6    
Revolving Credit Facility | GBP Revolver        
Debt Instrument [Line Items]        
Credit facility $ 0.0 $ 26.4    
Revolving Credit Facility | LIBOR | 1.4 Billion US Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.00%      
Revolving Credit Facility | LIBOR | US Revolver        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.20%    
Revolving Credit Facility | EURIBOR | EUR Revolver        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.20%    
Revolving Credit Facility | GPB LIBOR | 1.4 Billion GBP Revolving Credit Facility        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.00%      
Revolving Credit Facility | GPB LIBOR | GBP Revolver        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.20%