Debt - Standby Letter of Credit (Details) - Receivables Securitization Facility	1 Months Ended
Feb. 29, 2012 USD ($) installment	Sep. 30, 2015 USD ($)
Line of Credit Facility [Line Items]
Issuance of standby letter of credit \| $	$ 80,000,000	$ 18,900,000
Number of payment installments	4

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration