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Financial Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 0 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Private Placement, Notes [Member]
Jun. 23, 2014
Credit Agreement [Member]
Jun. 30, 2014
Credit Agreement [Member]
Apr. 16, 2014
Credit Agreement [Member]
Jun. 30, 2014
Credit Agreement [Member]
Minimum [Member]
Jun. 30, 2014
Credit Agreement [Member]
Maximum [Member]
May 20, 2013
Credit Agreement [Member]
Interest Rate Swap [Member]
Jul. 16, 2010
Credit Agreement [Member]
Interest Rate Swap [Member]
Debt Instrument [Line Items]                  
Debt issued   $ 150              
Interest rate   6.84%              
Maturity date   Oct. 25, 2017              
Year of maturity       2018          
Payment required on October 25, 2015   50              
Fair value of long-term debt   113.7              
Amount of credit facility       330          
Amount of credit facility outstanding       183          
Additional amount that can be borrowed on facility       147          
Notional amount               $ 110 $ 105
Fixed interest rate in swap               1.414% 2.04%
LIBOR spread     1.375%     1.25% 1.875%    
Effective annual rate       3.415%          
Maximum leverage ratio allowed 3.50                
Minimum interest coverage ratio required 3.00                
Leverage ratio 1.56                
Interest coverage ratio 10.64                
LIBOR rate       0.1552% 0.23%