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Fair Value (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets Held For Sale Carrying Value - Fair Value Disclosure $ 0.2     $ 0.2  
Impairment of Long-Lived Assets to be Disposed of       0.2  
Assets Held-for-sale, Long Lived, Fair Value Disclosure 0.0     0.0  
Long Lived Fixed Assets Held and Used at Carrying Value - Fair Value Disclosure 6.1     6.1  
Impairment of Long-Lived Assets Held-for-use       3.6  
Long Lived Assets Held and Used Fair Value 2.5     2.5  
Long-term Debt, Fair Value     $ 723.9   $ 532.2
Long-term Fixed-rate Debt, Carrying Value     684.3   507.3
Altavista Bearing Plant [Member] [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Long Lived Fixed Assets Held and Used at Carrying Value - Fair Value Disclosure 5.6     5.6  
Impairment of Long-Lived Assets Held-for-use 0.7 $ 2.4   (3.1)  
Deferred Gain on Sale of Property     1.6    
Long Lived Assets Held and Used Fair Value 2.5 $ 3.2   2.5  
Land [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets Held For Sale Carrying Value - Fair Value Disclosure 0.2     0.2  
Impairment of Long-Lived Assets to be Disposed of       0.2  
Assets Held-for-sale, Long Lived, Fair Value Disclosure 0.0     0.0  
Impairment of Long-Lived Assets Held-for-use       0.2  
Fair Value, Measurements, Recurring [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets, Fair Value Disclosure, Recurring     $ 158.8   $ 173.1
Property, Plant and Equipment [Member] | Benoni [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Assets Held-for-sale, Long Lived, Fair Value Disclosure 0.0     0.0  
Long Lived Fixed Assets Held and Used at Carrying Value - Fair Value Disclosure 0.5     0.5  
Impairment of Long-Lived Assets Held-for-use       (0.5)  
Long Lived Assets Held and Used Fair Value $ 0.0     $ 0.0