The floating could be tied to a Platt's index or the NYMEX.
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	2:det	_
2	floating	floating	NOUN	NN	Number=Sing	5	nsubj:pass	5:nsubj:pass	_
3	could	could	AUX	MD	VerbForm=Fin	5	aux	5:aux	_
4	be	be	AUX	VB	VerbForm=Inf	5	aux:pass	5:aux:pass	_
5	tied	tie	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	0:root	_
6	to	to	ADP	IN	_	10	case	10:case	_
7	a	a	DET	DT	Definite=Ind|PronType=Art	8	det	8:det	_
8-9	Platt's	_	_	_	_	_	_	_	_
8	Platt	Platt	PROPN	NNP	Number=Sing	10	nmod:poss	10:nmod:poss	_
9	's	's	PART	POS	_	8	case	8:case	_
10	index	index	NOUN	NN	Number=Sing	5	obl	5:obl:to	_
11	or	or	CCONJ	CC	_	13	cc	13:cc	_
12	the	the	DET	DT	Definite=Def|PronType=Art	13	det	13:det	_
13	NYMEX	NYMEX	PROPN	NNP	Number=Sing	10	conj	5:obl:to|10:conj:or	SpaceAfter=No
14	.	.	PUNCT	.	_	5	punct	5:punct	_
