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DEBT (Long-term debt) (Table) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
USD ($)
Jan. 30, 2015
USD ($)
Dec. 19, 2014
USD ($)
Debt Instrument [Line Items]            
Long-term Debt [Text Block]
Long-term debt at March 31, 2016 and December 31, 2015 consisted of the following:
 
March 31,
2016
 
December 31, 2015
2.20% senior notes due 2017
$
500.0

 
$
500.0

2.50% senior notes due 2018
400.0

 
400.0

4.625% senior notes due 2020
642.1

 
621.6

2.625% senior notes due 2020
500.0

 
500.0

3.75% senior notes due 2022
500.0

 
500.0

3.20% senior notes due 2022
500.0

 
500.0

4.00% senior notes due 2023
300.0

 
300.0

3.60% senior notes due 2025
1,000.0

 
1,000.0

4.70% senior notes due 2045
900.0

 
900.0

Term loan
715.0

 
715.0

Debt issuance costs
(49.7
)
 
(51.8
)
Capital leases
62.1

 
55.5

Total long-term debt
$
5,969.5

 
$
5,940.3

         
Long-term Debt, Excluding Current Maturities $ 5,969.5     $ 5,940.3    
Line of Credit Facility, Fair Value of Amount Outstanding 715.0     715.0    
Other Long-term Debt 715.0     55.5    
Senior Notes, Noncurrent         $ 2,900.0  
Capital Lease Obligations, Noncurrent $ 62.1          
Long-term Debt, Maturities, Repayment Terms P5Y          
Line of Credit Facility, Maximum Borrowing Capacity           $ 1,000.0
Credit Facility Option to Increase           250.0
Credit Facility, Maximum Swing Line Borrowings           100.0
Capital lease obligation $ 6.2     5.4    
Senior notes due 2017 [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Excluding Current Maturities 500.0     500.0    
Senior notes due 2018 [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Excluding Current Maturities 400.0     400.0    
Senior notes due 2020 [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Excluding Current Maturities 642.1     621.6    
Senior Notes, Noncurrent $ 500.0     500.0 $ 500.0  
Stated interest rate percentage 4.625%       2.625%  
Senior notes due 2022 [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Excluding Current Maturities $ 500.0     500.0    
Senior Notes, Noncurrent 500.0     500.0 $ 500.0  
Stated interest rate percentage         3.20%  
Senior notes due 2025 [Member]            
Debt Instrument [Line Items]            
Senior Notes, Noncurrent         $ 1,000.0  
Stated interest rate percentage         3.60%  
Senior notes due 2023 [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Excluding Current Maturities 300.0     300.0    
Senior notes due 2025 [Member] [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Excluding Current Maturities 1,000.0     1,000.0    
Senior notes due 2045 [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Excluding Current Maturities $ 900.0     $ 900.0    
Senior Notes, Noncurrent         $ 900.0  
Stated interest rate percentage         4.70%  
Long-term Debt [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Effective Percentage 1.68%          
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Debt to EBITDA (Leverage) Ratio 0          
Credit Facility, Maximum Letters of Credit           125.0
60-Day Debt Bridge Traunche [Domain]            
Debt Instrument [Line Items]            
Bridge Term Credit Facility Agreement, Maximum Borrowing Amount           $ 400.0
Maximum [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Debt to EBITDA (Leverage) Ratio       4.75    
Maximum [Member] | Covance [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Debt to EBITDA (Leverage) Ratio   3.75 4.25      
Prime Rate [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Interest Rate Description 0.00% to 0.60%          
Prime Rate [Member] | Term Loan [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Interest Rate Description 0.125% to 1.00%          
London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Commitment Fee Description 0.125% to 0.40%          
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Interest Rate Description 1.00% to 1.60%          
London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Interest Rate Description 1.125% to 2.00%