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Acquisitions, Goodwill, and Other Intangible Assets (Purchase Price Allocation) (Details) (Details) - USD ($)
$ in Millions
Jul. 02, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition, Purchase Price Allocation [Abstract]        
Goodwill   $ 1,039.1 $ 556.7 $ 564.9
DBRS [Member]        
Business Acquisition [Line Items]        
Consideration $ 682.1      
Business Acquisition, Purchase Price Allocation [Abstract]        
Cash and cash equivalents 8.5      
Accounts receivable and other current assets 28.8      
Intangible assets 284.1      
Goodwill 473.3      
Deferred revenue (43.2)      
Acquisition estimated fair value 682.1      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 12.8      
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Operating Lease Asset 33.3      
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Other Assets 5.7      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities (66.6)      
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation (35.0)      
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Other Liabilities $ (19.6)