Detail Of Certain Balance Sheet Captions (Additional Detail Related To Certain Balance Sheet Captions) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Detail Of Certain Balance Sheet Captions [Abstract]
Prepaid taxes	$ 12.6	$ 82.3
Prepaid expenses	32.5	39.8
Other	4.7	5.8
Total other current assets	49.8	127.9
Investments in joint ventures	34.2	30.8
Deposits for real-estate leases	11.3	11.4
Other	15.9	13.6
Total other assets	61.4	55.8
Salaries and benefits	60.7	69.6
Incentive compensation	90.5	116.8
Profit sharing contribution	4.5	12.6
Customer credits, advanced payments and advanced billings	18.4	15.3
Dividends	1.9	27.9
Professional service fees	51.8	50.6
Interest accrued on debt	3.6	17.6
Accounts payable	16.4	14.3
Income taxes	3.0	26.9
Restructuring	0.6	0.7
Deferred rent-current portion	1.0	2.7
Pension and other post retirement employee benefits	9.5	9.5
Other	49.3	49.9
Total accounts payable and accrued liabilities	311.2	414.4
Pension and other post retirement employee benefits	129.9	132.8
Deferred rent-non-current portion	107.4	100.4
Interest accrued on UTPs	37.3	33.7
Legacy and other tax matters	51.5	57.3
Other	31.5	38.1
Total other liabilities	$ 357.6	$ 362.3