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Investments in and Advances to Nonconsolidated Affiliates - Textual (Details) $ in Millions	Mar. 31, 2018 USD ($) entity	Dec. 31, 2017 USD ($)
Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]
Investments in and advances to nonconsolidated affiliates | $	$ 13.0	$ 11.9
Number of partially owned subsidiaries	6
Number of partially owned general or limited partnerships, limited liability companies of joint ventures	5
Minimum [Member]
Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]
Ownership interest in affiliates (percent)	1.00%
Maximum [Member]
Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]
Ownership interest in affiliates (percent)	60.00%

X

- Definition

The percentage of ownership by the Company in the investee accounted for under the equity or cost methods of accounting.

+ References

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- Definition

Investments in and advances to nonconsolidated affiliates.

+ References

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- Definition

Number of general or limited partnerships, limited liability companies, or joint ventures of which the Company has investments.

+ References

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- Definition

Number of partially owned subsidiaries in which the Company has investments but are not consolidated.

+ References

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- Definition

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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