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Supplemental Balance Sheet Disclosures (Change In Allowance For Doubtful Accounts) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Balance Sheet Disclosures [Abstract]
Balance at the beginning of the year	$ 1.4	$ 1.4	$ 1.8
Provision for bad debts included in selling, general and administrative expense	0.1	0.1	0.1
Uncollected receivables written off, net	(0.3)	(0.1)	(0.5)
Balance at the end of the year	$ 1.2	$ 1.4	$ 1.4

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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