Pension and Postretirement Plans Pension and Postretirement Assumptions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Healthcare cost trend	6.50%		6.50%
Rate to which the cost trend is assumed to decline (ultimate trend rate)	4.50%		4.50%
Year the rates reach the ultimate trend rate	2017		2016
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Service and interest costs for 2013	$ 0.2
Service and interest costs for 2013	(0.2)
Postretirement benefit obligation at December 31, 2013	4.7
Postretirement benefit obligation at December 31, 2013	$ (4.2)
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.30%	[1]	3.90%	4.90%
Expected long-term rate of return	7.75%		7.75%	8.25%
Future compensation growth rate	3.00%		3.00%	3.00%
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.40%	[2]	3.60%	4.50%
Expected long-term rate of return	0.00%		0.00%	0.00%
Future compensation growth rate	0.00%		0.00%	0.00%
Discount rate before remeasurement of pension or postretirement liability [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.10%	[2]
Discount rate after remeasurement of pension or postretirement liability [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rate	3.90%	[2]

[1] Discount rate used for the remeasurement of the management pension plan was consistent with the discount rate previously established.

[2] For the period January 1, 2013 through July 31, 2013, the date of the remeasurement, we used a 3.10% discount rate. From that date through the end of the year, we used a 3.90% discount rate.