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Debt and Other Financial Instruments - Components of Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Total debt $ 820.6 $ 830.9  
Debt payable within one year 37.9 47.9  
Debt payable after one year $ 782.7 $ 783.0  
Weighted average interest rates 7.70% 7.50%  
Senior Notes      
Debt Instrument [Line Items]      
Total debt $ 517.9 $ 517.7  
Term Loan      
Debt Instrument [Line Items]      
Total debt 265.9 266.2  
Line of credit      
Debt Instrument [Line Items]      
Total debt 21.8 22.0  
Other borrowings      
Debt Instrument [Line Items]      
Total debt     $ 42.0
Revolving Credit | Line of credit      
Debt Instrument [Line Items]      
Total debt $ 15.0 $ 25.0