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Income Taxes - Operating Loss Carryforwards (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Internal Revenue Service (IRS) [Member]
Dec. 31, 2013
Foreign Tax Authority [Member]
Dec. 31, 2012
Foreign Tax Authority [Member]
Dec. 31, 2013
Minimum [Member]
Foreign Tax Authority [Member]
Dec. 31, 2013
Minimum [Member]
State and Local Jurisdiction [Member]
Dec. 31, 2013
Maximum [Member]
Foreign Tax Authority [Member]
Dec. 31, 2013
Maximum [Member]
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]                  
Loss carryforwards $ 208.1 $ 133.8 $ 122.4 $ 239.5 $ 121.0        
Operating loss carryforwards subject to expiration       86.1          
Operating loss carryforwards not subject to expiration       $ 153.4          
Expiration date     Dec. 31, 2024     Dec. 31, 2014 Dec. 31, 2014 Dec. 31, 2033 Dec. 31, 2033