Supplemental Balance Sheet Information (Components of Prepaid Expenses and Other) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Components Of Prepaid Expenses And Other Current Assets [Line Items]
Deferred tax assets	$ 317.3	$ 319.0
Receivables other than trade	120.5	142.8
Prepaid taxes and tax refunds receivable	203.1	192.0
Prepaid brochure costs, paper and other literature	124.7	126.9
Short-term investments	18.5	18.0
Derivative Instruments and Hedges, Assets	5.6	18.8
Other	128.1	113.4
Prepaid expenses and other	$ 917.8	$ 930.9