XML 40 R28.htm IDEA: XBRL DOCUMENT v3.19.2

Shareholders’ Equity (Tables)

6 Months Ended

Jun. 30, 2019

Stockholders' Equity Note [Abstract]

Common and Preferred Stock Activity

The Common and Preferred Stock table below contains additional information about preferred stock conversions during the six months ended June 30, 2019 and 2018.

	Preferred stock			Common stock
Common and Preferred Stock Activity (in shares):	Series A convertible			Treasury			Outstanding
Beginning balance as of December 31, 2018	71,967			7,186,521			88,103,440
Conversion of convertible preferred stock	(3,392	)		—			339,166
Issuance for share-based compensation plans	—			—			451,161
Ending balance as of June 30, 2019	68,575			7,186,521			88,893,767
Beginning balance as of December 31, 2017	74,364			7,186,521			87,544,777
Conversion of convertible preferred stock	(241	)		—			24,167
Issuance for share-based compensation plans	—			—			32,147
Ending balance as of June 30, 2018	74,123			7,186,521			87,601,091

X

- Definition

Tabular disclosure of the change in preferred stock, treasury stock and common stock outstanding.

+ References

No definition available.

+ Details

Name:	cenx_ScheduleOfCommonandPreferredStockRollForwardTableTextBlock
Namespace Prefix:	cenx_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration