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Acquisitions and Discontinued Operations - Discontinued Operations (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Proceeds from divestiture of businesses $ 993.6 $ 0.0 $ 919.4 $ 0.0
Gain from sale of discontinued operations, net of tax   $ 0.0 0.0 181.1
Discontinued Operations, Disposed of by Sale        
Business Acquisition [Line Items]        
Proceeds from divestiture of businesses       3,150.0
Discontinued Operations        
Business Acquisition [Line Items]        
Separation costs     $ 84.2 39.3
Business exit costs       $ 56.4