Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2011

The calculation of basic and diluted earnings per share for each period presented was as follows:

	Year Ended December 31,
(amounts in millions, except per share data)	2011		2010		2009

Net income	$	521.9	$	562.9	$	475.5

Average shares outstanding (basic)		245.0		243.1		221.4
Common stock equivalents		2.1		2.4		2.2
Incremental shares from assumed conversion of convertible debentures		2.1		2.0		1.4

Shares utilized in diluted earnings per share calculation		249.2		247.5		225.0

Earnings per share:
Basic	$	2.13	$	2.32	$	2.15
Diluted	$	2.09	$	2.27	$	2.11