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Investments in and Advances to Nonconsolidated Affiliates - Textual (Details) $ in Millions	Jun. 30, 2018 USD ($) entity	Dec. 31, 2017 USD ($)
Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]
Investments in and advances to nonconsolidated affiliates | $	$ 12.6	$ 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

No definition available.

+ Details

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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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+ Details

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- Definition

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

+ References

No definition available.

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- Definition

Amount of investment in equity method investee and investment in and advance to affiliate.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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