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LONG-TERM DEBT - Long-Term Debt Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2013
Long-Term Debt Maturities      
2017 $ 18.1    
2018 18.1    
2019 18.1    
2020 18.1    
2021 518.1    
Thereafter 2,155.5    
Total long-term debt 2,746.0    
Discounts and deferred finance charges (64.8)    
Long-term debt 2,681.2 $ 1,813.7  
5.75% Senior Notes [Member]      
Long-Term Debt Maturities      
Total long-term debt 500.0   $ 500.0
Long-term debt $ 493.8 $ 492.5  
Stated interest rate 5.75%   5.75%