Commitments and Contingencies - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Future minimum payments on noncancelable leases in 2014	$ 4.2
Future minimum payments on noncancelable leases in 2015	2.1
Future minimum payments on noncancelable leases in 2016	1.4
Future minimum payments on noncancelable leases in 2017	1.4
Future minimum payments on noncancelable leases in 2018	0.9
Future minimum payments on noncancelable leases due in later years	7.2
Rental expense	$ 8.7	$ 10.3	$ 7.8