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Redeemable Noncontrolling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Combination, Step Acquisition [Abstract]              
Document Period End Date           Sep. 30, 2019  
Payments to Acquire Businesses and Interest in Affiliates         $ 45.0    
Beginning balance $ 13.0   $ 0.0 $ 0.0   $ 0.0 $ 0.0
Ending balance 12.0 $ 13.0   0.0 $ 0.0 12.0 0.0
Purchase of redeemable common and preferred stock 0.0   15.0 0.0   15.0 0.0
Adjustment to redemption value 0.0     0.0   0.0 0.0
Net loss attributable to redeemable noncontrolling interest (1.0)     0.0   (3.0) 0.0
Gain on acquisition 0.0   14.0 $ 0.0   14.0 $ 0.0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net $ 56.0         $ 56.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets     41.0        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     6.0        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets     25.0        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities     $ (1.0)        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 4.0