Goodwill and Other Intangibles (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Increase (decrease) in goodwill	$ 0.1		$ 0.2
Goodwill impairment	0		0
Amortization expense of amortizable intangible assets	1.3	1.5	2.6	3.0
Favorable Leases [Member]
Weighted-average remaining useful life of favorable leases, in years			10 years 1 month 18 days
Unfavorable Leases [Member]
Weighted-average remaining useful life of unfavorable leases, in years			5 years 6 months 15 days
Amortization benefit of unfavorable operating leases	$ 1.4	$ 1.7	$ 2.9	$ 3.4

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

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

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