Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2017	Dec. 31, 2016
Assets and Liabilities Measured at fair value on a recurring basis
Cash and cash equivalents		$ 17.1	$ 19.2
Restricted cash		2.9	2.7
Short-term investments		6.8	2.3
Foreign currency hedges		6.4	9.9
Foreign currency hedges		1.3	2.1
Assets Held-for-sale, Not Part of Disposal Group, Other	$ 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
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
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)
Altavista Bearing Plant [Member] [Member]
Assets and Liabilities Measured at fair value on a recurring basis
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
Level 1 [Member]
Assets and Liabilities Measured at fair value on a recurring basis
Cash and cash equivalents		0.0	0.0
Level 2 [Member]
Assets and Liabilities Measured at fair value on a recurring basis
Cash and cash equivalents		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
Fair Value, Measurements, Recurring [Member]
Assets and Liabilities Measured at fair value on a recurring basis
Cash and cash equivalents		112.4	129.6
Restricted cash		2.9	2.7
Short-term investments		12.0	9.4
Foreign currency hedges		6.4	9.9
Total Assets		157.6	173.1
Foreign currency hedges		1.3	2.1
Total Liabilities		1.3	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		111.1	125.0
Restricted cash		2.9	2.7
Short-term investments		0.0	0.0
Foreign currency hedges		0.0	0.0
Total Assets		114.0	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		1.3	4.6
Restricted cash		0.0
Restricted Cash and Cash Equivalents			0.0
Short-term investments		12.0	9.4
Foreign currency hedges		6.4	9.9
Total Assets		19.7	23.9
Foreign currency hedges		1.3	2.1
Total Liabilities		1.3	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