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Summary of Significant Accounting Policies (Foreign Currency Exchange) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Significant Transactions      
Net unrealized foreign currency translation gains $ 88.4 $ 85.7  
SEK
     
Significant Transactions      
Foreign currency exchange rate 6.4339 6.4973 6.8645
GBP
     
Significant Transactions      
Foreign currency exchange rate 0.6044 0.6154 0.6434
Canada, Dollars
     
Significant Transactions      
Foreign currency exchange rate 1.0625 0.9955 1.0193