Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Benefit Plans [Line Items]
Pension expense	$ 6.5	$ 5.6	$ 4.7
Incentive compensation expense	12.8	13.2	24.7
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of employee's gross pay	3.00%
Deferred compensation plan assets	5.3	3.0
Deferred compensation plan liability	5.3	3.0
Locations Outside The U.S. and Netherlands [Member]
Employee Benefit Plans [Line Items]
Plan costs for defined contribution plans	3.6	3.6	2.2
United States [Member]
Employee Benefit Plans [Line Items]
Plan costs for defined contribution plans	$ 2.1	$ 1.8	$ 1.5