Employee Benefit Plans (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2013

Dec. 31, 2012

Employee Benefit Plans

Schedule of the components of net periodic benefit expense (income) for the defined benefit pension plans

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2013			2012			2013			2012
Service costs	$	0.6		$	0.7		$	1.9		$	2.1
Interest costs	9.3			9.3			28.0			27.8
Expected return on plan assets	(10.9		)	(11.1		)	(32.8		)	(33.4		)
Amortization	0.9			0.4			2.7			1.3
Net periodic benefit expense (income)	$	(0.1	)	$	(0.7	)	$	(0.2	)	$	(2.2	)

	Year ended December 31,
(in millions)	2012			2011			2010
Service costs	$	5.0		$	6.1		$	3.1
Interest costs	37.7			39.8			40.0
Expected return on plan assets	(44.7		)	(46.5		)	(40.4		)
Amortization	2.1			1.3			2.2
Net periodic benefit expense	$	0.1		$	0.7		$	4.9