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DEBT (Credit Facilities) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
USD ($)
Jan. 30, 2015
USD ($)
Dec. 19, 2014
USD ($)
Jun. 30, 2011
USD ($)
Line of Credit Facility [Line Items]              
Previously Recorded Litigation Reserve In Connection With False Claims Act Lawsuit             $ 15.0
Senior Notes, Noncurrent         $ 2,900.0    
Convertible Subordinated Debt, Current $ 95.0     $ 94.5      
Senior Notes current 2015 $ 325.0     325.0      
Long-term Debt, Maturities, Repayment Terms P5Y            
Line of Credit, Current $ 0.0            
Line of Credit Facility, Fair Value of Amount Outstanding 715.0     715.0      
Revolving Credit Facility, maximum borrowing capacity           $ 1,000.0  
Capital Lease Obligations, Current 6.2     5.4      
Debt, Current 425.4     423.9      
Other Long-term Debt $ 715.0     55.5      
Credit Facility Option to Increase           250.0  
Credit Facility, Maximum Swing Line Borrowings           100.0  
Long-term Debt [Member]              
Line of Credit Facility [Line Items]              
Revolving Credit Facility, interest rate at period end 1.68%            
Senior notes due 2020 [Member]              
Line of Credit Facility [Line Items]              
Senior Notes, Noncurrent $ 500.0     500.0 $ 500.0    
Debt Instrument, Interest Rate, Stated Percentage 4.625%       2.625%    
Senior notes due 2025 [Member]              
Line of Credit Facility [Line Items]              
Senior Notes, Noncurrent         $ 1,000.0    
Debt Instrument, Interest Rate, Stated Percentage         3.60%    
Senior notes due 2045 [Member]              
Line of Credit Facility [Line Items]              
Senior Notes, Noncurrent         $ 900.0    
Debt Instrument, Interest Rate, Stated Percentage         4.70%    
Senior notes due 2022 [Member]              
Line of Credit Facility [Line Items]              
Senior Notes, Noncurrent $ 500.0     $ 500.0 $ 500.0    
Debt Instrument, Interest Rate, Stated Percentage         3.20%    
60-Day Debt Bridge Traunche [Domain]              
Line of Credit Facility [Line Items]              
Bridge Term Credit Facility Agreement, Maximum Borrowing Amount           400.0  
Target Ratio to Resume Share Repurchase [Member]              
Line of Credit Facility [Line Items]              
Debt to EBITDA (leverage) ratio 2.5            
Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Credit Facility, Maximum Letters of Credit           $ 125.0  
Debt to EBITDA (leverage) ratio 0            
Line of Credit Facility, Interest Rate at Period End 1.53%            
Maximum [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Debt to EBITDA (leverage) ratio       4.75      
Covance [Member] | Maximum [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Debt to EBITDA (leverage) ratio   3.75 4.25        
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 0.60%            
London Interbank Offered Rate (LIBOR) [Member]              
Line of Credit Facility [Line Items]              
Line of Credit Facility, Commitment Fee Description 0.125% to 0.40%            
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 1.00% to 1.60%            
Excluding Underwriting Discounts & Other Fees [Member]              
Line of Credit Facility [Line Items]              
Senior Notes, Noncurrent         $ 2,870.2