Share-Based Compensation Plans (Schedule of Cash Proceeds, Tax Benefits and Intrinsic Value Related to Stock Options) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Proceeds from Stock Options Exercised	$ 8.6	[1]	$ 16.8	[1]	$ 23.9	[1]
Tax (obligation)/ benefit realized for stock options exercised	(3.7)		1.3		3.3
Intrinsic value of stock options exercised	$ 2.2		$ 10.0		$ 14.6

[1] Non-cash financing activities included the change in fair market value of interest-rate swap agreements of $(8.4) in 2012, $53.2 in 2011, and $66.8 in 2010 (see Note 5, Debt and Other Financing).