Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2011

Marketable Securities [Abstract]

Schedule of Marketable Securities

At December 31, Long-term marketable securities included within Other noncurrent assets in the Consolidated Balance Sheet were as follows:

	2011						2010
In millions	Amortized cost or cost		Unrealized gains		Fair value		Amortized cost or cost		Unrealized gains		Fair value
Equity securities	$	5.7	$	4.7	$	10.4	$	6.9	$	8.6	$	15.5