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Amortization of Favorable Contacts (Details) - Favorable Contracts - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Amortization of favorable contracts      
2016 $ 70.5    
2017 70.5    
2018 50.6    
2019 45.6    
2020 38.4    
Net carrying amount $ 275.6 $ 266.1 $ 0.0