Derivatives and Hedging Activities (Details 4) - Fair Value and Cash Flow Hedging [Member] - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2018	Dec. 31, 2019	Sep. 30, 2018
Interest Expense [Member]
Total amounts of income and expense line items presented in the statement of operations and comprehensive loss in which the effects of fair value or cash flow hedges are recorded	$ 4.1	$ 27.8	$ 20.6
Gain/(loss) on cash flow hedging relationships in Subtopic 815-20	0.4	1.2
Foreign Currency Remeasurement [Member]
Total amounts of income and expense line items presented in the statement of operations and comprehensive loss in which the effects of fair value or cash flow hedges are recorded	0.7	(3.2)	20.6
Gain/(loss) on cash flow hedging relationships in Subtopic 815-20	$ 2.0	$ 3.2	$ 0.3

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

Name:	us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration