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Acquisitions, Goodwill, and Other Intangible Assets (Narrative) (Details) - USD ($)
12 Months Ended
Jul. 02, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Impairment of intangible assets   $ 0 $ 0 $ 0
Goodwill   1,039,100,000 556,700,000 564,900,000
Goodwill impairment loss   0 $ 0 $ 0
DBRS [Member]        
Business Acquisition [Line Items]        
Percentage of voting interests acquired 100.00%      
Consideration $ 682,100,000      
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   127,600,000    
Acquisition estimated fair value 682,100,000      
Intangible assets 284,100,000      
Goodwill $ 473,300,000      
Operating expense   123,500,000    
Transaction-related costs   $ 6,500,000