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Insurance Reserves - Letters of Credit (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Insurance Reserves |
Total amount committed under letters of credit | $ 31.9

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

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant