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Employee Benefits (Tables)

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs [Table Text Block]



	Three Months Ended								Six Months Ended
	June 30,								June 30,
	2015				2014				2015				2014
	(in millions)
Pension Plan and SERP benefits
Service cost	$	0.4			$	0.7			$	1.0			$	1.4
Interest cost	1.1				1.4				2.4				2.8
Expected return on plan assets	(1.4		)		(1.2		)		(2.8		)		(2.4		)
Amortization of prior service costs ⁽¹⁾	0.1				1.2				0.9				2.5
Amortization of actuarial losses ⁽¹⁾	—				0.2				0.3				0.4
Curtailment loss ⁽²⁾	11.2				2.0				11.2				2.0
Special termination benefits ⁽³⁾	—				0.3				—				0.3
Periodic expense	$	11.4			$	4.6			$	13.0			$	7.0

Medical Plan benefits
Interest cost	$	—			$	0.1			$	0.1			$	0.2
Amortization of prior service costs ⁽¹⁾	0.1				0.1				0.1				0.2
Curtailment loss ⁽²⁾	—				0.4				—				0.4
Periodic expense	$	0.1			$	0.6			$	0.2			$	0.8