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Fair Value (Tables)
 9 Months Ended
Sep. 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 September 30, 2017 and December 31, 2016:
 
September 30, 2017
 
Total
Level 1
Level 2
Level 3
Assets:
 
 
 
 
Cash and cash equivalents
$
125.4

$
120.5

$
4.9

$
—

Cash and cash equivalents measured at net asset value
11.8

—

—

—

Restricted cash
3.3

3.3

—

—

Short-term investments
16.5

—

16.5

—

Short-term investments measured at net asset value
0.2

—

—

—

Foreign currency hedges
1.6

—

1.6

—

Total Assets
$
158.8

$
123.8

$
23.0

$
—

Liabilities:
 
 
 
 
Foreign currency hedges
$
3.9

$
—

$
3.9

$
—

Total Liabilities
$
3.9

$
—

$
3.9

$
—



 
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 nine months ended September 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
$
5.6

$
(3.1
)
$
2.5

Equipment at Benoni bearing plant
0.5

(0.5
)
—

Total long-lived assets held and used
$
6.1

$
(3.6
)
$
2.5