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Acquisitions and Discontinued Operations - Acquisitions (Details) - USD ($)
$ in Millions
 7 Months Ended 12 Months Ended
Jun. 07, 2018
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Business acquisition and other investments, net of cash acquired     $ 104.4 $ 147.1 $ 180.8
Net income     $ 97.2 $ 65.3 81.2
Cues, Inc.          
Business Acquisition [Line Items]          
Business acquisition and other investments, net of cash acquired $ 164.4        
Cash acquired $ 20.6        
Revenue of acquiree since acquisition   $ 52.3      
Loss of acquiree since acquisition date   0.4      
Cues, Inc. | Fair Value Adjustment to Inventory          
Business Acquisition [Line Items]          
Net income   $ (4.3)      
Selling, General and Administrative Expenses | Cues, Inc. | Acquisition-related Costs          
Business Acquisition [Line Items]          
Net income         $ (2.4)