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Commitments and Contingencies (Narratives) (Details) $ in Millions	3 Months Ended	75 Months Ended
	Mar. 31, 2018 USD ($) claim	Mar. 31, 2018 USD ($) claim	Dec. 31, 2017 USD ($) petition	Dec. 31, 2016 petition	Sep. 19, 2016 claim	Dec. 31, 2015 petition	Dec. 31, 2014 petition	Dec. 31, 2013 petition	Dec. 31, 2012 petition
Loss contingency
Accrued liability for the outcomes of non-income based tax audits | $	$ 2.5	$ 2.5	$ 1.7
Indemnification liability | $	1.6	1.6	$ 1.6
Litigation and Claims
Ad valorem tax benefit | $	4.7	82.9
Ad valorem tax benefit agreed to by a number of appraisal review boards and county appraisal districts | $	15.9	15.9
Ad valorem tax benefit in litigation | $	$ 67.0	$ 67.0
Number of petitions | petition			112	113		120	115	109	176
Number of cases appealed | claim	3	3
Loss Contingencies [Line Items]
Number of pending cases | claim	5	5
Number of cases settled | claim	3
Similar Judge
Loss Contingencies [Line Items]
Number of cases settled | claim	2
United ISD
Loss Contingencies [Line Items]
Number of pending cases | claim	4	4			5

X

- Definition

The amount of ad valorem tax expense (benefit) included as a component of cost of goods sold (excluding depreciation and amortization).

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- Definition

The amount of ad valorem tax expense (benefit) agreed to by one or more appraisal review boards and/or county appraisal districts.

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- Definition

The amount of ad valorem tax expense (benefit) in litigation in various courts.

+ References

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- Definition

The balance of indemnified liabilities as of the balance sheet date.

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Loss Contingency, Claims Appealed, Number

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- Definition

Number of Petitions

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- Definition

The amount of estimated interest accrued as of the balance sheet date arising from income tax examinations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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Number of claims settled.

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Number of pending claims pertaining to a loss contingency.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

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