Employee Benefit Plans Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013 New_Entrant_Pension_Plan	Jun. 30, 2012	Jun. 30, 2013 New_Entrant_Pension_Plan	Jun. 30, 2012
Pension and Other Postretirement Benefit Expense [Abstract]
Number of new entrants after the Pension Plans were frozen	0		0
Contributions by employer	$ 0.8	$ 1.5	$ 1.3	$ 1.5
Expected employer contributions during the remaining of 2013			$ 2.1