Commitments and Contingencies Commitments and Contingencies - Environmental Remediation (Details) - USD ($) $ in Millions	3 Months Ended	55 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Number of years ago that the gas station contaminated the soil	35 years
Environmental remediation expense	$ 0.0	$ 0.1	$ 4.0
Insurance recoveries			$ 1.9
Amount of coverage	$ 5.0

Number of Years Ago that the Gas Station Contaminated the Soil

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- Definition

The aggregate amount of potential recovery for covered loss event(s) under property and casualty insurance policies providing environmental liability coverage.

+ References

No definition available.

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- References

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- Definition

The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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- Definition

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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