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Debt and Credit Agreements Long-Term Debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 1,604.6 $ 1,612.2
Long-term Debt, Current Maturities 323.9 1.9
Long-term Debt, Excluding Current Maturities 1,280.7 1,610.3
Debt Instrument, Unamortized Debt Issuance Costs 12.3 15.0
2.25% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 300.0  
Long-term Debt, Gross 299.4 298.8
Debt Instrument, Unamortized Discount 0.1  
Debt Instrument, Unamortized Debt Issuance Costs 0.5  
Long-term Debt, Fair Value [1] $ 301.4 299.3
Debt Instrument, Maturity Date Nov. 15, 2017  
Interest Rate, Stated Percentage 2.25%  
Debt Instrument, Interest Rate, Effective Percentage 2.30%  
4.00% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 250.0  
Long-term Debt, Gross 247.0 246.4
Debt Instrument, Unamortized Discount 1.7  
Debt Instrument, Unamortized Debt Issuance Costs 1.3  
Long-term Debt, Fair Value [1] $ 258.4 250.9
Debt Instrument, Maturity Date Mar. 15, 2022  
Interest Rate, Stated Percentage 4.00%  
Debt Instrument, Interest Rate, Effective Percentage 4.13%  
3.75% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 500.0  
Long-term Debt, Gross 496.6 496.0
Debt Instrument, Unamortized Discount 0.9  
Debt Instrument, Unamortized Debt Issuance Costs 2.5  
Long-term Debt, Fair Value [1] $ 503.3 484.8
Debt Instrument, Maturity Date Feb. 15, 2023  
Interest Rate, Stated Percentage 3.75%  
Debt Instrument, Interest Rate, Effective Percentage 4.32%  
4.20% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 500.0  
Long-term Debt, Gross 496.2 495.8
Debt Instrument, Unamortized Discount 0.8  
Debt Instrument, Unamortized Debt Issuance Costs 3.0  
Long-term Debt, Fair Value [1] $ 511.6 496.4
Debt Instrument, Maturity Date Apr. 15, 2024  
Interest Rate, Stated Percentage 4.20%  
Debt Instrument, Interest Rate, Effective Percentage 4.24%  
Notes Payable, Other Payables [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 65.4 75.2
Long-term Debt, Fair Value [1] $ 65.4 $ 75.2
[1] See Note 10 for information on the fair value measurement of our long-term debt.