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DEBT (Senior Notes) (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 19, 2014
Debt Instrument [Line Items]        
Senior notes due 2018 $ 500.0 $ 0.0    
Convertible Subordinated Debt, Current 1.4 8.7    
Short term debt issuance costs 0.2 0.5    
Long-term Debt, Excluding Current Maturities 6,101.3 5,990.9    
Line of Credit Facility, Maximum Borrowing Capacity       $ 1,000.0
Credit Facility Option to Increase       350.0
Credit Facility, Maximum Swing Line Borrowings       $ 100.0
Fair Value Hedges, Net $ 4.1 3.1    
Debt Instrument, Basis Spread on Variable Rate 2.298%      
Line of Credit Facility, Fair Value of Amount Outstanding   0.0    
Long term debt issuance costs $ 35.5 40.2    
Notes Payable 1.4 1.8    
Debt, Current 502.6 10.0    
Foreign Currency Contract, Asset, Fair Value Disclosure 20.0 2.8    
Senior notes due 2023 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities 300.0 300.0    
Senior notes due 2024 [Member] [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities 600.0 600.0    
Senior notes due 2027 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities 600.0 600.0    
Senior notes due 2045 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities 900.0 900.0    
2019 Term Loan [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Fair Value of Amount Outstanding 850.0      
Senior notes due 2020 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Excluding Current Maturities 604.1 596.9    
Senior Notes, Noncurrent $ 0.0 500.0    
Stated interest rate percentage 4.625%      
2017 Term Loan [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Fair Value of Amount Outstanding $ 277.0 $ 527.0 $ 750.0