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Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Goodwill [Line Items]    
Goodwill, acquisition date fair value $ 321.4 $ 25.9
Goodwill 321.4 25.9
Other intangible assets, accumulated amortization 47.7 34.8
Goodwill and intangible assets, acquisition date fair value 532.9 96.9
Goodwill and intangible assets, net carrying value 485.2 62.1
NSM Holding Co LLC    
Goodwill [Line Items]    
Goodwill, acquisition date fair value 295.5 0.0
Goodwill 295.5 0.0
Other intangible assets, acquisition date fair value 140.5 0.0
Other intangible assets, accumulated amortization 5.0 0.0
Other intangible assets, net carrying value 135.5 0.0
MediaAlpha    
Goodwill [Line Items]    
Goodwill, acquisition date fair value 18.3 18.3
Goodwill 18.3 18.3
Other intangible assets, acquisition date fair value 69.9 69.9
Other intangible assets, accumulated amortization 42.3 34.5
Other intangible assets, net carrying value 27.6 35.4
Buzzmove    
Goodwill [Line Items]    
Goodwill, acquisition date fair value 7.6 7.6
Goodwill 7.6 7.6
Other intangible assets, acquisition date fair value 1.1 1.1
Other intangible assets, accumulated amortization 0.4 0.3
Other intangible assets, net carrying value 0.7 0.8
Customer relationships | NSM Holding Co LLC    
Goodwill [Line Items]    
Other intangible assets, acquisition date fair value 85.5 0.0
Other intangible assets, accumulated amortization 3.6 0.0
Other intangible assets, net carrying value 81.9 0.0
Customer relationships | MediaAlpha    
Goodwill [Line Items]    
Other intangible assets, acquisition date fair value 26.8 26.8
Other intangible assets, accumulated amortization 4.3 2.4
Other intangible assets, net carrying value 22.5 24.4
Trade names | NSM Holding Co LLC    
Goodwill [Line Items]    
Other intangible assets, acquisition date fair value 51.2 0.0
Other intangible assets, accumulated amortization 1.1 0.0
Other intangible assets, net carrying value 50.1 0.0
Trade names | Buzzmove    
Goodwill [Line Items]    
Other intangible assets, acquisition date fair value 0.6 0.6
Other intangible assets, accumulated amortization 0.1 0.1
Other intangible assets, net carrying value 0.5 0.5
Information technology | NSM Holding Co LLC    
Goodwill [Line Items]    
Other intangible assets, acquisition date fair value 3.8 0.0
Other intangible assets, accumulated amortization 0.3 0.0
Other intangible assets, net carrying value 3.5 0.0
Information technology | MediaAlpha    
Goodwill [Line Items]    
Other intangible assets, acquisition date fair value 33.3 33.3
Other intangible assets, accumulated amortization 29.2 24.3
Other intangible assets, net carrying value 4.1 9.0
Information technology | Buzzmove    
Goodwill [Line Items]    
Other intangible assets, acquisition date fair value 0.5 0.5
Other intangible assets, accumulated amortization 0.3 0.2
Other intangible assets, net carrying value 0.2 0.3
Other | MediaAlpha    
Goodwill [Line Items]    
Other intangible assets, acquisition date fair value 9.8 9.8
Other intangible assets, accumulated amortization 8.8 7.8
Other intangible assets, net carrying value 1.0 2.0
Other Intangible Assets    
Goodwill [Line Items]    
Other intangible assets, acquisition date fair value 211.5 71.0
Other intangible assets, accumulated amortization 47.7 34.8
Other intangible assets, net carrying value 163.8 36.2
Non-controlling interest    
Goodwill [Line Items]    
Goodwill and intangible assets, net carrying value (40.6) (21.1)
Total    
Goodwill [Line Items]    
Goodwill and intangible assets, net carrying value $ 444.6 $ 41.0