Income Taxes (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Tax Credit Carryforward [Line Items]
Unrecognized tax benefits affecting effective tax rate	$ 56.9
Interest and penalties associated with unrecognized tax benefits (Operations)	3.7
Interest and penalties associated with unrecognized tax benefits (Balance Sheet)	28.7
State and Local Jurisdiction [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	339.4
Deferred tax assets, operating loss and tax credit carryforwards	26.0
Foreign Tax Authority [Member]
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	12.2
Deferred tax assets, operating loss and tax credit carryforwards	8.5
Operating loss carryforwards, valuation allowance	20.7
Wisconsin Research And Development Credit [Member] | State and Local Jurisdiction [Member] | Wisconsin [Member]
Tax Credit Carryforward [Line Items]
Net capital loss carryforwards	$ 13.1