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Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Restricted cash and cash equivalents	$ 4.1	$ 3.6
Other assets
Cash and Cash Equivalents [Line Items]
Restricted cash and cash equivalents	4.1	3.0
Other current assets
Cash and Cash Equivalents [Line Items]
Restricted cash and cash equivalents		0.6
Less than wholly-owned subsidiaries
Cash and Cash Equivalents [Line Items]
Restricted cash and cash equivalents	25.3	31.1
Majority-owned Joint Ventures
Cash and Cash Equivalents [Line Items]
Restricted cash and cash equivalents	$ 12.9	$ 18.9

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(2))
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-Name Accounting Standards Codification
-Topic 230
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-Name Accounting Standards Codification
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585

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