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Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Indefinite-lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets $ 10.7   $ 10.7   $ 0.0
Finite-Lived Intangible Assets [Line Items]          
Definite-lived intangible assets, gross carrying value 1.9   1.9   0.6
Accumulated amortization (0.4)   (0.4)   (0.4)
Definite-lived intangible assets, net carrying value 1.5   1.5   0.2
Total intangible assets, gross carrying value 12.6   12.6   0.6
Total intangible assets, net carrying value 12.2   12.2   0.2
Amortization expense 0.0 $ 0.0 0.0 $ 0.0  
Estimated future amortization expense, to not exceed     0.2    
Trade name          
Indefinite-lived Intangible Assets [Line Items]          
Indefinite-lived intangible assets 10.7   10.7   0.0
Customer relationships          
Finite-Lived Intangible Assets [Line Items]          
Definite-lived intangible assets, gross carrying value 0.8   0.8   0.0
Accumulated amortization 0.0   0.0   0.0
Definite-lived intangible assets, net carrying value 0.8   0.8   0.0
Other          
Finite-Lived Intangible Assets [Line Items]          
Definite-lived intangible assets, gross carrying value 1.1   1.1   0.6
Accumulated amortization (0.4)   (0.4)   (0.4)
Definite-lived intangible assets, net carrying value $ 0.7   $ 0.7   $ 0.2
Customer Relationships and Other Intangibles          
Finite-Lived Intangible Assets [Line Items]          
Average useful life (years)     10 years