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Fair Value (Tables) | 6 Months Ended
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Jun. 30, 2017
Fair Value Disclosures [Abstract] |
Assets and liabilities measured at fair value on a recurring basis | The following tables present the fair value hierarchy for those financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2017 and December 31, 2016:
| June 30, 2017
| Total | Level 1 | Level 2 | Level 3
Assets: |  |  |  |
Cash and cash equivalents | $ | 429.0 |  | $ | 425.3 |  | $ | 3.7 |  | $ | — |
Cash and cash equivalents measured at net asset value | 16.1 |  | — |  | — |  | — |
Restricted cash | 2.8 |  | 2.8 |  | — |  | — |
Short-term investments | 14.5 |  | — |  | 14.5 |  | — |
Short-term investments measured at net asset value | 4.8 |  | — |  | — |  | — |
Foreign currency hedges | 1.2 |  | — |  | 1.2 |  | — |
Total Assets | $ | 468.4 |  | $ | 428.1 |  | $ | 19.4 |  | $ | — |
Liabilities: |  |  |  |
Foreign currency hedges | $ | 5.7 |  | $ | — |  | $ | 5.7 |  | $ | — |
Total Liabilities | $ | 5.7 |  | $ | — |  | $ | 5.7 |  | $ | — |
| December 31, 2016
| Total | Level 1 | Level 2 | Level 3
Assets: |  |  |  |
Cash and cash equivalents | $ | 129.6 |  | $ | 125.0 |  | $ | 4.6 |  | $ | — |
Cash and cash equivalents measured net asset value | 19.2 |  | — |  | — |  | — |
Restricted cash | 2.7 |  | 2.7 |  | — |  | — |
Short-term investments | 9.4 |  | — |  | 9.4 |  | — |
Short-term investments measured at net asset value | 2.3 |  | — |  | — |  | — |
Foreign currency hedges | 9.9 |  | — |  | 9.9 |  | — |
Total Assets | $ | 173.1 |  | $ | 127.7 |  | $ | 23.9 |  | $ | — |
Liabilities: |  |  |  |
Foreign currency hedges | $ | 2.1 |  | $ | — |  | $ | 2.1 |  | $ | — |
Total Liabilities | $ | 2.1 |  | $ | — |  | $ | 2.1 |  | $ | — |
Fair Value Measurements, Nonrecurring [Table Text Block] | The following table presents those assets measured at fair value on a nonrecurring basis for the six months ended June 30, 2016 using Level 3 inputs:
| Carrying Value | Fair Value Adjustment | Fair Value
Long-lived assets held for sale: |  |  |
Land | $ | 0.2 |  | $ | (0.2 | ) | $ | — |
Total long-lived assets held for sale | $ | 0.2 |  | $ | (0.2 | ) | $ | — |
Long-lived assets held and used: |  |  |
Altavista bearing plant | $ | 5.7 |  | $ | (2.4 | ) | $ | 3.3 |
Total long-lived assets held and used | $ | 5.7 |  | $ | (2.4 | ) | $ | 3.3 |

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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