Employee Benefit Plans Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 New_Entrant_Pension_Plan	Sep. 30, 2012	Sep. 30, 2013 New_Entrant_Pension_Plan	Sep. 30, 2012
Pension and Other Postretirement Benefit Expense [Abstract]
Number of new entrants after the Pension Plans were frozen	0		0
Contributions by employer	$ 1.4	$ 1.1	$ 2.7	$ 2.7
Expected employer contributions during the remaining of 2013			$ 0.7