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Long-term Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 1,584.8 $ 1,604.6
Long-term Debt, Current Maturities 301.7 323.9
Long-term Debt, Excluding Current Maturities $ 1,283.1 1,280.7
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 $ 0.0  
Debt Instrument, Unamortized Debt Issuance Costs 0.2  
Long-term Debt, Gross 299.8 299.4
Long-term Debt, Fair Value [1] $ 300.5 301.4
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 $ 1.5  
Debt Instrument, Unamortized Debt Issuance Costs 1.2  
Long-term Debt, Gross 247.3 247.0
Long-term Debt, Fair Value [1] $ 259.0 258.4
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 $ 0.9  
Debt Instrument, Unamortized Debt Issuance Costs 2.3  
Long-term Debt, Gross 496.8 496.6
Long-term Debt, Fair Value [1] $ 521.0 503.3
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 $ 0.7  
Debt Instrument, Unamortized Debt Issuance Costs 2.8  
Long-term Debt, Gross 496.5 496.2
Long-term Debt, Fair Value [1] 526.6 511.6
Other notes payable and capitalized leases    
Debt Instrument [Line Items]    
Long-term Debt, Gross 44.4 65.4
Long-term Debt, Fair Value [1] $ 44.4 $ 65.4
[1] See Note 11 for information on the fair value measurement of our long-term debt.