Income Taxes (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Tax credits available to offset future tax liabilities
U.S. tax credits	$ 14.1
Undistributed earnings of foreign subsidiaries on which U.S. income taxes are not provided	920.7
Portion of unrecognized tax benefits, which if recognized, would result in a reduction of the effective tax rate	27.7
Reconciliation of beginning and ending amount of unrecognized tax benefits
Gross unrecognized tax benefits at the beginning of the year	27.0	23.2
Gross increases - tax positions in prior periods	5.5	3.1
Gross decreases - tax positions in prior periods	(0.6)	(1.4)
Gross increases - current period tax positions	3.1	2.1
Gross decreases - current period tax positions	(0.4)
Gross unrecognized tax benefits at the end of the year	34.6	27.0
Accrued interest and penalties related to uncertain tax positions	5.6
Penalties and interest expense relating to unrecognized tax benefits	1.3
Additional reserves recorded in relation to audits	6.3	2.8
Research and Development
Tax credits available to offset future tax liabilities
U.S. tax credits	9.6
Foreign tax credits
Tax credits available to offset future tax liabilities
U.S. tax credits	$ 4.5