Transactions with Affiliates (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Allocation of costs
General and administrative expense	$ 12.8	$ 13.0	$ 39.9	$ 39.8
Service
Allocation of costs
Direct labor expenses	$ 1.8	$ 2.6	$ 5.3	$ 5.0

Cost of labor directly related to good produced and service rendered. Includes, but is not limited to, payroll cost and equity-based compensation.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(2))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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