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Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]          
Definite-lived intangible assets, gross carrying value $ 94.9   $ 94.9   $ 1.9
Accumulated amortization (1.3)   (1.3)   (0.5)
Definite-lived intangible assets, net carrying value 93.6   93.6   1.4
Total intangible assets, gross carrying value 164.1   164.1   10.7
Total intangible assets, net carrying value 162.8   $ 162.8   10.2
Finite-lived intangible asset, useful life     10 years    
Amortization of intangibles 0.7 $ 0.1 $ 0.8 $ 0.1  
Estimated amortization of intangibles, remainder of 2017 4.3   4.3    
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 56.1   56.1    
Indefinite-lived intangible assets (excluding goodwill) 69.2   69.2   8.8
Trade Names          
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets (excluding goodwill) 69.2   69.2   8.8
Customer Relationships          
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]          
Definite-lived intangible assets, gross carrying value 90.8   90.8   0.8
Accumulated amortization (0.7)   (0.7)   (0.1)
Definite-lived intangible assets, net carrying value 90.1   $ 90.1   0.7
Finite-lived intangible asset, useful life     10 years    
Other          
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]          
Definite-lived intangible assets, gross carrying value 4.1   $ 4.1   1.1
Accumulated amortization (0.6)   (0.6)   (0.4)
Definite-lived intangible assets, net carrying value $ 3.5   $ 3.5   $ 0.7
Finite-lived intangible asset, useful life     5 years