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Income Taxes (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Valuation allowance      
Federal income tax at statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Provision for taxes on earnings $ 8.6us-gaap_IncomeTaxExpenseBenefit $ 36.1us-gaap_IncomeTaxExpenseBenefit $ 38.0us-gaap_IncomeTaxExpenseBenefit
Foreign      
Valuation allowance      
Valuation allowance on the net deferred tax asset operating loss carryforward, foreign 495.7us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
   
State of Wisconsin      
Valuation allowance      
Total valuation allowance having an unfavorable impact to income tax expense $ 1.1us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityAxis
= stpr_WI