Other Employee Benefit Plans Other Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
401(k) matching contributions	$ 4.9	$ 5.8	$ 7.5
Pension liability	$ 3.4	$ 8.1