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Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Statement Of Cash Flows [Abstract] |  |
Cash of discontinued operations | $ 0.0 | $ 0.0

X
- Definition Amount of currency on hand, demand deposits with banks or financial institutions, and other kinds of accounts that have the general characteristics of demand deposits, held by a disposal group. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_StatementOfCashFlowsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration