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Income Taxes (Details 4) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
State
Dec. 31, 2013
State of Wisconsin
Dec. 31, 2013
Foreign
Aug. 31, 2012
Federal
Dec. 31, 2013
Maximum
Income Tax Disclosure [Abstract]                  
Deferred Tax Liability Not Recognized, Determination of Deferred Tax Liability is Not Practicable, Undistributed Earnings of Foreign Subsidiaries 732.9                
Operating loss carryforwards                  
Cash and cash equivalents $ 54.9 $ 73.2 $ 68.3 $ 82.0     $ 23.9    
Net operating loss carryforwards         519.3   672.1    
Deferred tax asset for net operating loss carryforwards generated in the state of Wisconsin           18.8      
Income tax examination information                  
Foreign currency loss incurred in 2008 disallowed from deductibility               380.9  
Largest increase to company's potential federal tax expense and cash outflow                 $ 134.0