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Net Income Per Share (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]                      
Interest expense $ 8.0 $ 9.5 $ 9.3 $ 13.3 $ 12.7 $ 12.3 $ 12.7 $ 12.7 $ 40.1 $ 50.4 $ 11.6
Maximum percentage of common stock shares for preferred stock conversion 19.99%               19.99%    
Maximum number of common stock shares for preferred stock conversion 0.9               0.9    
Convertible Debt [Member]
                      
Debt Instrument [Line Items]                      
Interest expense                 $ 20.3 $ 19.3 $ 4.7