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Fair Value (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2016
Sep. 30, 2017
Dec. 31, 2016
Assets and Liabilities Measured at fair value on a recurring basis          
Cash and cash equivalents       $ 11.8 $ 19.2
Restricted cash       3.3 2.7
Short-term investments       0.2 2.3
Foreign currency hedges       1.6 9.9
Foreign currency hedges       3.9 2.1
Assets Held-for-sale, Not Part of Disposal Group, Other $ 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    
Land [Member]          
Assets and Liabilities Measured at fair value on a recurring basis          
Assets Held-for-sale, Not Part of Disposal Group, Other 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)    
Altavista Bearing Plant [Member] [Member]          
Assets and Liabilities Measured at fair value on a recurring basis          
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    
Long Lived Assets Held and Used Fair Value 2.5 $ 3.2 2.5    
Level 1 [Member]          
Assets and Liabilities Measured at fair value on a recurring basis          
Cash and cash equivalents       0.0 0.0
Short-term investments       0.0  
Level 2 [Member]          
Assets and Liabilities Measured at fair value on a recurring basis          
Cash and cash equivalents       0.0 0.0
Short-term investments       0.0 0.0
Level 3 [Member]          
Assets and Liabilities Measured at fair value on a recurring basis          
Cash and cash equivalents       0.0 0.0
Fair Value, Measurements, Recurring [Member]          
Assets and Liabilities Measured at fair value on a recurring basis          
Cash and cash equivalents       125.4 129.6
Restricted cash       3.3 2.7
Short-term investments       16.5 9.4
Foreign currency hedges       1.6 9.9
Total Assets       158.8 173.1
Foreign currency hedges       3.9 2.1
Total Liabilities       3.9 2.1
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]          
Assets and Liabilities Measured at fair value on a recurring basis          
Cash and cash equivalents       120.5 125.0
Restricted cash       3.3 2.7
Short-term investments       0.0 0.0
Foreign currency hedges       0.0 0.0
Total Assets       123.8 127.7
Foreign currency hedges       0.0 0.0
Total Liabilities       0.0 0.0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]          
Assets and Liabilities Measured at fair value on a recurring basis          
Cash and cash equivalents       4.9 4.6
Restricted cash       0.0  
Restricted Cash and Cash Equivalents         0.0
Short-term investments       16.5 9.4
Foreign currency hedges       1.6 9.9
Total Assets       23.0 23.9
Foreign currency hedges       3.9 2.1
Total Liabilities       3.9 2.1
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]          
Assets and Liabilities Measured at fair value on a recurring basis          
Cash and cash equivalents       0.0 0.0
Restricted cash       0.0 0.0
Short-term investments       0.0 0.0
Foreign currency hedges       0.0 0.0
Total Assets       0.0 0.0
Foreign currency hedges       0.0 0.0
Total Liabilities       $ 0.0 $ 0.0
Property, Plant and Equipment [Member] | Benoni [Member]          
Assets and Liabilities Measured at fair value on a recurring basis          
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