Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Tax Disclosure [Abstract]
Effective income tax rate, continuing operations	3.60%	23.60%	17.30%
Tax impact of patent infringement settlement		$ 11.0
Other tax adjustments		6.2
Reversal of valuation allowance on foreign tax credits	21.2
Additional tax expense for company's loss on future tax benefit related to Medicare Part D subsidy			$ 2.5