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Long-term Debt - Table 2 (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Long-term Debt by Maturity    
Total debt and capital lease obligations $ 1,377.6 $ 1,253.5
Face Amount [Member]
   
Long-term Debt by Maturity    
April 1 through December 31, 2013 10.0  
2014 10.7  
2015 9.0  
2016 9.0  
2017 130.1  
2018 310.1  
Thereafter 899.5  
Total debt and capital lease obligations 1,378.4  
Net Amount [Member]
   
Long-term Debt by Maturity    
April 1 through December 31, 2013 10.0  
2014 10.7  
2015 9.0  
2016 9.0  
2017 130.1  
2018 311.5  
Thereafter 897.3  
Total debt and capital lease obligations $ 1,377.6