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DEBT (Senior Notes) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2016
Jun. 30, 2015
Dec. 31, 2015
Feb. 19, 2015
Jan. 30, 2015
Dec. 19, 2014
Debt Instrument [Line Items]            
Line of Credit, Current $ 0.0          
Convertible Subordinated Debt, Current 95.0   $ 94.5      
Senior Notes current 2015 325.0   325.0      
Short term debt issuance costs 0.8   1.0      
Long-term Debt, Excluding Current Maturities $ 5,969.5   5,940.3      
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
Senior Notes, Noncurrent         $ 2,900.0  
Debt Instrument, Basis Spread on Variable Rate 2.298%          
Line of Credit Facility, Fair Value of Amount Outstanding $ 715.0   715.0      
Long term debt issuance costs 49.7   51.8      
Capital Lease Obligations, Noncurrent 62.1          
Other Long-term Debt 715.0   55.5      
Capital Lease Obligations, Current 6.2   5.4      
Debt, Current 425.4   423.9      
Senior notes due 2018 [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Excluding Current Maturities 400.0   400.0      
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%  
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 2017 [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Excluding Current Maturities 500.0   500.0      
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%  
Covance [Member]            
Debt Instrument [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt       $ 250.0    
Make-whole payment   $ 37.4