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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, 2017
Sep. 30, 2017
Dec. 31, 2016
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Definite-lived intangible assets, gross carrying value $ 95.2 $ 95.2 $ 1.9
Accumulated amortization (3.6) (3.6) (0.5)
Definite-lived intangible assets, net carrying value 91.6 91.6 1.4
Total intangible assets, gross carrying value 164.7 164.7 10.7
Total intangible assets, net carrying value 161.1 $ 161.1 10.2
Finite-lived intangible asset, useful life   12 years  
Amortization of intangibles 2.2 $ 3.0  
Estimated amortization of intangibles, remainder of 2017 2.2 2.2  
Estimated amortization of intangibles, 2018 8.7 8.7  
Estimated amortization of intangibles, 2019 8.7 8.7  
Estimated amortization of intangibles, 2020 8.1 8.1  
Estimated amortization of intangibles, 2021 7.7 7.7  
Estimated amortization of intangibles, thereafter 56.2 56.2  
Indefinite-lived intangible assets (excluding goodwill) 69.5 69.5 8.8
Trade Names      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Indefinite-lived intangible assets (excluding goodwill) 69.5 69.5 8.8
Customer Relationships      
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]      
Definite-lived intangible assets, gross carrying value [1] 90.9 90.9 0.8
Accumulated amortization [1] (2.7) (2.7) (0.1)
Definite-lived intangible assets, net carrying value [1] 88.2 $ 88.2 0.7
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] 4.3 $ 4.3 1.1
Accumulated amortization [1] (0.9) (0.9) (0.4)
Definite-lived intangible assets, net carrying value [1] $ 3.4 $ 3.4 $ 0.7
Finite-lived intangible asset, useful life   5 years  
[1] Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and 5 years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 12 years.