Goodwill and Other Intangibles (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Increase (decrease) in goodwill	$ 0.1
Goodwill impairment	0
Amortization expense of amortizable intangible assets	1.3	1.5
Favorable Leases [Member]
Weighted-average remaining useful life of favorable leases, in years	10.1
Unfavorable Leases [Member]
Weighted-average remaining useful life of unfavorable leases, in years	5.6
Amortization benefit of unfavorable operating leases	$ 1.5	$ 1.7

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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+ Details

- Definition

The change during the reporting period in the carrying value of goodwill. The change could be the result of new goodwill acquired, goodwill impairment during the period, goodwill written off related to the sale of a business or other adjustments to goodwill.

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