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Divestitures (Tables)
 12 Months Ended
Dec. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]  
Disposal Groups, Including Discontinued Operations
The following table summarizes the amounts included in the gain on sale of the business for the year ended December 31, 2017:
 
 
Year ended December 31
(in millions)
 
2017
Proceeds received
 
$
23.7

Intangibles and internally developed software
 
(4.5
)
Goodwill
 
(2.4
)
Other assets and liabilities
 
(0.1
)
Total gain on sale of business
 
$
16.7