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Commitments and Contingencies, Commitments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Minimum rental commitments      
Rental expense $ 7.5 $ 10.0 $ 10.0
Minimum rental commitments, 2014 4.7    
Minimum rental commitments, 2015 4.0    
Minimum rental commitments, 2016 2.9    
Minimum rental commitments, 2017 2.1    
Minimum rental commitments, 2018 2.0    
Minimum rental commitments, 2019 and thereafter 29.4    
Purchase obligations      
Purchase Obligation, 2014 278.5    
Purchase Obligation, 2015 4.9    
Purchase Obligation, 2016 0.4    
Purchase Obligation, 2017 0.4    
Purchase Obligation, 2018 0.4    
Purchase Obligation, 2019 and thereafter $ 1.9