Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Operating Loss Carryforwards [Line Items]
Alternative minimum tax carryforward		$ 10.9
Valuation allowance on NOL and capital loss carryforwards	0.4	7.4
Undistributed foreign earnings	82.9
Unrecognized tax benefits including accrued interest and penalties	17.2	15.1
Accrued interest and penalties	4.7	4.3
Domestic Country [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards		8.8
Research and development tax credit carryforwards	6.5	19.8
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	51.4	61.3
Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0.7	1.1
Research and development tax credit carryforwards		$ 4.3