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 [Abstract]
Contributions to the defined contribution plan	$ 19.9	$ 19.9	$ 18.6
Senior Managers and Executive Officers [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Liabilities related to deferred compensation plan included in accrued expenses	13.5	11.7
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets recorded in other non-current assets	$ 4.9	$ 2.7