Supply Chain Financing (Details) (USD $) In Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Supply Chain Financing
Mark-Up premium expressed as a percentage of the purchase price			For the first six months of 2011 the Mark-Up was based on 2 month LIBOR plus a margin of 2.75%.
Maximum amount owing to financing party			$ 49.3
Liability to financing party			23.6		25.0
Purchase cost of inventory invoiced by financing party	43.0	55.4	91.4	106.6
Mark-Up as interest expense	$ 0.3	$ 0.5	$ 0.7	$ 0.9