Long-term Debt - Receivables Facility (Details) (Receivables Facility [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 16, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Secured debt, Maximum Borrowing Capacity	$ 105.0	$ 90.0	$ 105.0
Debt cost, 3-month LIBOR plus			1.35%
Debt Instrument, Unused Borrowing Capacity, Fee percentage		0.45%	0.40%
Receivables facility debt outstanding	57.0		57.0	18.0
Receivables facility debt available but not utilized	20.2		20.2	51.9
Receivables facililty, debt aggregate costs	$ 1.4			$ 1.3	$ 1.6
Average liquidation period, Receivables pool	1.6		1.6
Average discount rate, Receivables facility	1.80%		1.80%
Minimum [Member]
Debt Instrument [Line Items]
Debt cost, 3-month LIBOR plus		1.50%	1.20%
Maximum [Member]
Debt Instrument [Line Items]
Debt cost, 3-month LIBOR plus		1.75%	1.35%