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Long-term Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 1,607.8 $ 1,612.2
Long-term Debt, Current Maturities 24.5 1.9
Long-term Debt, Excluding Current Maturities $ 1,583.3 1,610.3
2.25% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Nov. 15, 2017  
Debt Instrument, Interest Rate, Stated Percentage 2.25%  
Debt Instrument, Interest Rate, Effective Percentage 2.30%  
Debt Instrument, Unamortized Discount $ 0.2  
Debt Instrument, Unamortized Debt Issuance Costs 0.5  
Long-term Debt, Gross 299.3 298.8
Long-term Debt, Fair Value [1] $ 301.5 299.3
4.00% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Mar. 15, 2022  
Debt Instrument, Interest Rate, Stated Percentage 4.00%  
Debt Instrument, Interest Rate, Effective Percentage 4.13%  
Debt Instrument, Unamortized Discount $ 1.7  
Debt Instrument, Unamortized Debt Issuance Costs 1.4  
Long-term Debt, Gross 246.9 246.4
Long-term Debt, Fair Value [1] $ 266.8 250.9
3.75% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Feb. 15, 2023  
Debt Instrument, Interest Rate, Stated Percentage 3.75%  
Debt Instrument, Interest Rate, Effective Percentage 4.32%  
Debt Instrument, Unamortized Discount $ 1.0  
Debt Instrument, Unamortized Debt Issuance Costs 2.6  
Long-term Debt, Gross 496.4 496.0
Long-term Debt, Fair Value [1] $ 524.9 484.8
4.20% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date Apr. 15, 2024  
Debt Instrument, Interest Rate, Stated Percentage 4.20%  
Debt Instrument, Interest Rate, Effective Percentage 4.24%  
Debt Instrument, Unamortized Discount $ 0.8  
Debt Instrument, Unamortized Debt Issuance Costs 3.1  
Long-term Debt, Gross 496.1 495.8
Long-term Debt, Fair Value [1] 539.0 496.4
Other notes payable and capitalized leases    
Debt Instrument [Line Items]    
Long-term Debt, Gross 69.1 75.2
Long-term Debt, Fair Value [1] $ 69.1 $ 75.2
[1] See Note 11 for information on the fair value measurement of our long-term debt.