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Restructuring Costs Restructuring Liability (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve $ 0.0 $ 7.7
Restructuring and Related Cost, Incurred Cost 1.9  
Restructuring Costs, Paid or Settled (9.6)  
Restructuring Reserve 0.0  
One-time Termination Benefits [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 0.0 1.2
Restructuring and Related Cost, Incurred Cost 1.0  
Restructuring Costs, Paid or Settled (2.2)  
Restructuring Reserve 0.0  
Lease Termination Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 0.0 0.0
Restructuring and Related Cost, Incurred Cost 0.0  
Restructuring Reserve 0.0  
Accelerated Share Based Compensation [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 0.0 0.0
Restructuring and Related Cost, Incurred Cost 0.5  
Restructuring Costs, Paid or Settled (0.5)  
Restructuring Reserve 0.0  
Retention Expense [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 0.0 6.5
Restructuring and Related Cost, Incurred Cost 0.4  
Restructuring Costs, Paid or Settled (6.9)  
Restructuring Reserve 0.0  
Pension curtailment [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve 0.0 $ 0.0
Restructuring and Related Cost, Incurred Cost 0.0  
Restructuring Costs, Paid or Settled 0.0  
Restructuring Reserve $ 0.0