Pension and Other Postretirement Benefit Plans (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Non-cash postretirement benefits curtailment and settlement gain	$ 45.0	$ 0	$ 7.0
Estimated Future Employer Contributions in Next Fiscal Year	0.2
Percentage funded from proceeds obtained from reversion of Plan	100.00%
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Defined Contribution Plan, Cost Recognized	2.4	2.5	2.3
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of Net Gains (Losses)	2.7
Amortization of Net Prior Service Cost (Credit)	(0.2)
Plan amendments	0	0.2
Settlements, Benefit Obligation	0	0
Non-cash postretirement benefits curtailment and settlement gain	0	0
Accumulated Benefit Obligation	177.4	176.2
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of Net Gains (Losses)	(12.8)
Amortization of Net Prior Service Cost (Credit)	2.1
Plan amendments	(3.5)	(1.2)
Settlements, Benefit Obligation	(0.9)	0
Non-cash postretirement benefits curtailment and settlement gain	$ 45.0	$ 0