Employee Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2012

Employee Retirement Plans [Abstract]

Components of net retirement cost

	Three Months Ended March  31,
	2012			2011
	(in millions)
Service cost	$	0.2		$	0.3
Interest		4.8			4.9
Expected return on plan assets		(5.6	)		(5.7	)
Actuarial loss		0.9			0.5
Defined benefit expense		0.3			0.0
Profit sharing		2.6			2.3
Net expense	$	2.9		$	2.3