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Financing Arrangements (Senior Notes) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
6.375% Senior Notes [Member]
Dec. 31, 2007
6.375% Senior Notes [Member]
Dec. 31, 2013
Change in Control and Below Investment Grade Rating [Member]
6.375% Senior Notes [Member]
Debt Instrument [Line Items]          
Debt instrument, aggregate principal amount       $ 400,000,000  
Debt instrument, stated interest rate (as a percentage)       6.375%  
Debt instrument, maturity date       Jun. 01, 2017  
Debt Instrument, Redemption Price, Percentage     100.00%   101.00%
Default on senior notes     0    
Number of days in year per debt terms     360 days    
Number of months in year per debt terms     12 months    
Number of days in month per debt terms     30 days    
Debt instrument, benchmark for variable rate basis     Treasury rate    
Treasury rate basis points (as a percentage)     0.30%    
Senior note, failure to perform covenant     60 days    
Threshold amount for noncompliance with senior note indenture     50,000,000    
Minimum borrowed aggregate principal amount     50,000,000    
Senior note, grace period for defaulted payment     30 days    
Senior notes amount $ 399,300,000 $ 399,095,000