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Schedule of Changes in Unrecognized Income Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2013
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward          
Increases in prior period tax positions $ 7.9 $ 4.2 $ 2.0    
Decreases in prior period tax positions (0.1) (0.6) (0.6)    
Increases in current period tax positions 0.7 1.3 0.7    
Unrecognized tax benefits 17.8 15.0 73.4 $ 17.8 $ 72.8
Expiration of the statute of limitations (1.1) (0.7) (0.5)    
Settlements (4.3) (62.1) (0.7)    
Interest and penalties, net (0.3) (0.5) (0.3)    
Ending balance $ 17.8 $ 15.0 73.4    
Unrecognized tax benefits classified within deferred taxes as a reduction of net operating loss carryforwards       7.6  
Income tax penalties and interest accrued       3.6  
Unrecognized tax benefits that would impact effective tax rate       15.0  
Unrecognized tax benefits that will be recognized within 12 months of year end       $ 9.0  
Temporary difference [Member]          
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward          
Unrecognized tax benefits     60.9    
Ending balance     $ 60.9