Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	8 Months Ended
Mar. 31, 2017	Mar. 31, 2017
Commitments and Contingencies [Abstract]
Payments received from the State of Illinois		$ 65.4
Maximum term of employment agreements	4 years

Cash received for the settlement of litigation during the current period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

Name:	us-gaap_ProceedsFromLegalSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration