Fair Value (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2017	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
Impairment of Long-Lived Assets to be Disposed of	0.2
Assets Held-for-sale, Long Lived, Fair Value Disclosure	0.0
Long Lived Fixed Assets Held and Used at Carrying Value - Fair Value Disclosure	5.7
Impairment of Long-Lived Assets Held-for-use	2.4
Long Lived Assets Held and Used Fair Value	3.3
Long-term Debt, Fair Value		$ 536.6	$ 532.2
Long-term Fixed-rate Debt, Carrying Value		508.8	507.3
Altavista Bearing Plant [Member] [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Held-for-sale, Long Lived, Fair Value Disclosure	3.3
Long Lived Fixed Assets Held and Used at Carrying Value - Fair Value Disclosure	5.7
Impairment of Long-Lived Assets Held-for-use	2.4
Long Lived Assets Held and Used Fair Value	3.3
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
Impairment of Long-Lived Assets to be Disposed of	0.2
Assets Held-for-sale, Long Lived, Fair Value Disclosure	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		$ 157.6	$ 173.1