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Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]          
Definite-lived intangible assets, gross carrying value $ 112.8   $ 112.8   $ 93.8
Accumulated amortization, intangible assets (19.7)   (19.7)   (13.4)
Definite-lived intangible assets, net carrying value 93.1   93.1   80.4
Indefinite-lived intangible assets (excluding goodwill) 72.0   72.0   62.7
Total intangible assets, gross carrying value 184.8   $ 184.8   156.5
Finite-lived intangible asset, useful life     12 years    
Amortization expense 2.4 $ 2.0 $ 6.4 $ 6.1  
Estimated amortization of intangibles, remainder of 2019 2.4   2.4    
Estimated amortization of intangibles, 2020 9.6   9.6    
Estimated amortization of intangibles, 2021 9.6   9.6    
Estimated amortization of intangibles, 2022 9.5   9.5    
Estimated amortization of intangibles, 2023 9.3   9.3    
Estimated amortization of intangibles, thereafter 52.7   52.7    
Intangible assets, net of accumulated amortization of $19.7 and $13.4, respectively 165.1   165.1   143.1
Trade names          
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets (excluding goodwill) 72.0   72.0   62.7
Customer relationships          
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]          
Definite-lived intangible assets, gross carrying value [1] 108.6   108.6   90.9
Accumulated amortization, intangible assets [1] (18.2)   (18.2)   (12.1)
Definite-lived intangible assets, net carrying value [1] 90.4   $ 90.4   78.8
Finite-lived intangible asset, useful life     12 years    
Other          
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]          
Definite-lived intangible assets, gross carrying value [1] 4.2   $ 4.2   2.9
Accumulated amortization, intangible assets [1] (1.5)   (1.5)   (1.3)
Definite-lived intangible assets, net carrying value [1] $ 2.7   $ 2.7   $ 1.6
Finite-lived intangible asset, useful life     8 years    
[1]
Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and eight years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 12 years.