Income taxes (Tables)

6 Months Ended

Jun. 30, 2013

Income Tax Disclosure [Abstract]

Tax Provision before Discrete Items Reconciled to Recorded Provision for Income Taxes

Our tax provision before discrete items is reconciled to our recorded provision for income taxes for the three and six months ended June 30, 2013 and 2012 as follows (in millions):

	Three months ended June 30,						Six months ended June 30,
	2013			2012			2013			2012
Provision for income taxes before discrete items	$	2.4		$	2.6		$	4.3		$	5.2
Interest related to unrecognized tax benefits		0.1			0.1			0.2			0.2
Provision related to reassessment of taxes resulting from the filing of prior year foreign tax returns		—			—			0.3			—
Benefit related to restructuring and other expenses		(0.1	)		(0.3	)		(0.7	)		(0.6	)
Benefit related to the 2012 U.S. federal research and development tax credit		—			—			(3.2	)		—
Tax deductions related to ESPP dispositions		(0.1	)		(0.1	)		(0.3	)		(0.4	)
Benefit related to reversals of uncertain tax positions due to statute of limitation expirations		(0.3	)		(0.3	)		(0.3	)		(0.3	)
Provision for income taxes	$	2.0		$	2.0		$	0.3		$	4.1