Goodwill And Other Intangible Assets And Liabilities (Schedule Of Earnings To Be Recognized On Below Market Sales Contract) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Below-market sales contracts revenue for 2012 (remaining six months)	$ 29.4
Below-market sales contracts revenue for 2013	46.0
Below-market sales contracts revenue for 2014	23.1
Below-market sales contracts revenue for 2015	23.0
Below-market sales contracts revenue for 2016	23.0
Below-market sales contracts revenue for 2017
Total	$ 144.5