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DEBT (Credit Facilities) (Details)
$ in Millions
3 Months Ended
Jun. 30, 2018
USD ($)
Rate
Dec. 31, 2017
USD ($)
Dec. 19, 2014
USD ($)
Line of Credit Facility [Line Items]      
Long-term Debt, Excluding Current Maturities $ 6,039.4 $ 6,344.6  
Convertible Subordinated Debt, Current 8.9 8.8  
Long-term Line of Credit 0.0    
Line of Credit Facility, Fair Value of Amount Outstanding 0.0 72.0  
Revolving Credit Facility, maximum borrowing capacity     $ 1,000.0
Capital Lease Obligations, Current 8.0 8.3  
Notes Payable 1.8 1.8  
Debt, Current 417.8 417.5  
Other Long-term Debt 0.0 57.8  
Credit Facility Option to Increase     350.0
Credit Facility, Maximum Swing Line Borrowings     100.0
Notes Payable $ 8.0 8.9  
2017 Term Loan [Member]      
Line of Credit Facility [Line Items]      
Revolving Credit Facility, interest rate at period end 3.22%    
Senior notes due 2027 [Member]      
Line of Credit Facility [Line Items]      
Long-term Debt, Excluding Current Maturities $ 600.0 600.0  
Revolving Credit Facility, interest rate at period end | Rate 3.60%    
Senior notes due 2024 [Member] [Member]      
Line of Credit Facility [Line Items]      
Long-term Debt, Excluding Current Maturities $ 600.0 600.0  
Revolving Credit Facility, interest rate at period end | Rate 3.25%    
Senior notes due 2020 [Member]      
Line of Credit Facility [Line Items]      
Senior Notes, Noncurrent $ 500.0 500.0  
Long-term Debt, Excluding Current Maturities $ 594.4 604.1  
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 $ 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 0    
Prime Rate [Member] | Term Loan [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Interest Rate Description 0.125% to 1.00%    
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] | Term Loan [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Interest Rate Description 1.125% to 2.00%    
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%