Employee Benefit Plans - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 SERP	Jun. 30, 2014 Defined benefit plans
Defined Benefit Plan Disclosure [Line Items]
Contributions to benefit plan		$ 0.4	$ 0.1
Estimated future contributions		0.4
Withdrawal from multi-employer pension plan, undiscounted liability	6.5
Withdrawal from multi-employer pension plan, recorded liability	$ 4.1
Withdrawal from multi-employer pension plan, liability repayment, term	20 years