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DEBT (Credit Facilities) (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 19, 2014
Line of Credit Facility [Line Items]        
Line of Credit Facility, Remaining Borrowing Capacity $ 927.6      
Long-term Debt, Excluding Current Maturities 6,101.3 $ 5,990.9    
Convertible Subordinated Debt, Current 1.4 8.7    
Line of Credit Facility, Fair Value of Amount Outstanding   0.0    
Revolving Credit Facility, maximum borrowing capacity       $ 1,000.0
Notes Payable 1.4 1.8    
Debt, Current 502.6 10.0    
Credit Facility Option to Increase       350.0
Credit Facility, Maximum Swing Line Borrowings       100.0
Notes Payable $ 5.7 7.2    
2017 Term Loan [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Interest Rate, Effective Percentage 3.17%      
Senior notes due 2027 [Member]        
Line of Credit Facility [Line Items]        
Long-term Debt, Excluding Current Maturities $ 600.0 600.0    
Senior notes due 2024 [Member] [Member]        
Line of Credit Facility [Line Items]        
Long-term Debt, Excluding Current Maturities 600.0 600.0    
Senior notes due 2020 [Member]        
Line of Credit Facility [Line Items]        
Senior Notes, Noncurrent 0.0 500.0    
Long-term Debt, Excluding Current Maturities $ 604.1 596.9    
Debt Instrument, Interest Rate, Stated Percentage 4.625%      
Senior notes due 2045 [Member]        
Line of Credit Facility [Line Items]        
Long-term Debt, Excluding Current Maturities $ 900.0 900.0    
Senior notes due 2022 [Member]        
Line of Credit Facility [Line Items]        
Senior Notes, Noncurrent 500.0 500.0    
Long-term Debt, Excluding Current Maturities 500.0 500.0    
2017 Term Loan [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Fair Value of Amount Outstanding $ 277.0 $ 527.0 $ 750.0  
Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Credit Facility, Maximum Letters of Credit       $ 150.0
Debt to EBITDA (leverage) ratio 3.3      
Prime Rate [Member] | 2019 Term Loan [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Interest Rate Description 0.0% to 0.175%      
Prime Rate [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Interest Rate Description 0.00% to 0.25%      
Prime Rate [Member] | 2017 Term Loan [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Interest Rate Description 0.0% to 0.50%      
London Interbank Offered Rate (LIBOR) [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Commitment Fee Description 0.10% to 0.25%      
London Interbank Offered Rate (LIBOR) [Member] | 2019 Term Loan [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Interest Rate Description 0.55% to 1.175%      
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Interest Rate Description 0.775% to 1.25%      
London Interbank Offered Rate (LIBOR) [Member] | 2017 Term Loan [Member]        
Line of Credit Facility [Line Items]        
Line of Credit Facility, Interest Rate Description 0.875% to 1.50%