Employee Benefit Plans (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Benefit Plans
Base contribution as a percentage of employee gross pay (as a percent)		2.00%
Employer maximum match of an employee's contributions of first 4% of eligible compensation (as a percent)	100.00%
Percentage of eligible compensation, matched 100% by employer	4.00%
Company's matching contributions under certain 401(k) savings plans	$ 4.2	$ 4.0	$ 0.5
Employee Benefit Plans
Charges for pension plans	0.1		8.3
Supplemental compensation agreement with Timothy P. Horne
Supplemental compensation paid on an annual basis	0.6	0.6	0.5
Minimum
Supplemental compensation agreement with Timothy P. Horne
Hours per year required to be worked as a consultant in return for certain annual compensation	300 hours
Maximum
Supplemental compensation agreement with Timothy P. Horne
Hours per year required to be worked as a consultant in return for certain annual compensation	500 hours
EMEA pension plans
Employee Benefit Plans
Charges for pension plans	$ 5.8	$ 6.0	$ 6.2