Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Carrying Amount and Fair Values of the Company's Assets and Liabilities Measured on a Recurring Basis

The following table presents the carrying amount and fair values of the Company’s assets and liabilities measured on a recurring basis:

	June 30, 2013				December 31, 2012
(in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets
Non-derivatives:
Cash and cash equivalents	$	54.7	$	54.7	$	22.4	$	22.4
Short-term investments		4.3		4.3		5.1		5.1
Non-financial assets (Level 3 measurement):
Goodwill—Octane Additives		0.6		0.6		1.3		1.3
Derivatives (Level 1 measurement):
Other non-current assets:
Commodity swaps		0.0		0.0		0.1		0.1
Foreign currency forward exchange contracts		0.1		0.1		0.8		0.8
Liabilities
Non-derivatives:
Long-term debt (including current portion)	$	33.0	$	33.0	$	30.0	$	30.0
Non-financial liabilities (Level 3 measurement):
Stock equivalent units		9.5		9.5		12.6		12.6
Acquisition-related contingent consideration		4.5		4.5		4.3		4.3