Employee Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2011

Employee Retirement Plans (Tables) [Abstract]

Components of net retirement cost

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2011			2010			2011			2010
				(in millions)
Service cost	$	0.2		$	0.3		$	0.5		$	0.5
Interest		4.9			4.9			9.8			9.8
Expected return on plan assets		(5.7	)		(5.0	)		(11.4	)		(10.0	)
Actuarial loss		0.5			0.6			1.0			1.2
Profit sharing		2.2			2.2			4.5			4.3
Net expense	$	2.1		$	3.0		$	4.4		$	5.8