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Borrowing Arrangements (Principal Maturities of Long-Term Debt) (Details ) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Future minimum payments of total long-term debt    
2016 $ 16.5  
2017 20.4  
2018 20.1  
2019 20.0  
2020 152.3  
Thereafter 0.0  
Total debt 229.3  
Current portion of long-term obligations under credit facility and other long-term borrowings 15.2 $ 14.5
Less: Original discount on borrowings 1.8  
Less: Deferred financing costs 2.4  
Total long-term obligations under credit facility and other borrowings $ 209.9 $ 236.3