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Fair Value Measurements Reconciliation of Level 3 Liabilities (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Business Combination, Contingent Consideration, Liability $ 0.0 $ 6.7
Unrealized losses included in other non-operating (income) expense (0.4)  
Goodwill, Purchase Accounting Adjustments (6.1)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements $ (0.2)