Employee Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2012

Employee Retirement Plans [Abstract]

Components of net retirement cost

	Three Months Ended June  30,						Six Months Ended June  30,
	2012			2011			2012			2011
	(in millions)
Service cost	$	0.2		$	0.2		$	0.4		$	0.5
Interest		4.9			4.9			9.7			9.8
Expected return on plan assets		(5.8	)		(5.7	)		(11.4	)		(11.4	)
Actuarial loss		0.9			0.5			1.8			1.0
Defined benefit expense		0.2			(0.1	)		0.5			(0.1	)
Profit sharing		3.2			2.2			5.8			4.5
Net expense	$	3.4		$	2.1		$	6.3		$	4.4