Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Percent of performance stock awards participants will be able to earn during the eighth performance year.

No definition available.

Percent of performance stock awards participants will be able to earn during the ninth performance year.

No definition available.

Percent of performance stock awards participants will be able to earn during the seventh performance year.

No definition available.

Three-year cumulative earnings per share diluted.

No definition available.