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Schedule of Changes in Unrecognized Income Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
unrecognized tax benefit [Line Items]            
Unrecognized tax benefits classified within deferred taxes as a reduction of net operating loss carryforwards       $ 11.7    
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward            
Increases in prior period tax positions $ 0.0 $ 7.9 $ 4.3      
Decreases in prior period tax positions (0.7) (0.1) (0.2)      
Increases in current period tax positions 0.7 0.6 1.3      
Unrecognized tax benefits 14.7 22.7 19.6 14.7 $ 22.7 $ 76.8
Expiration of the statute of limitations (0.4) (1.1) (0.5)      
Settlements (7.6) (4.2) (62.1)      
Ending balance $ 14.7 $ 22.7 $ 19.6      
Income tax penalties and interest accrued       3.2 $ 3.6  
Unrecognized tax benefits that would impact effective tax rate       6.0    
Unrecognized tax benefits that will be recognized within 12 months of year end       $ 1.0    
Temporary difference [Member]            
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward            
Unrecognized tax benefits           $ 60.9