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Goodwill and Other Intangibles - Definite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Apr. 30, 2017
Dec. 31, 2016
Jun. 30, 2017
Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]        
Estimated Useful Life (years) 5 years      
Gross Carrying Amount     $ 257.9 $ 222.0
Accumulated Amortization     (24.9) (7.0)
Net Carrying Amount     233.0 215.0
Customer-related        
Finite-Lived Intangible Assets [Line Items]        
Gross Carrying Amount     229.5 200.3
Accumulated Amortization     (18.5) (5.2)
Net Carrying Amount     $ 211.0 195.1
Customer-related | Minimum        
Finite-Lived Intangible Assets [Line Items]        
Estimated Useful Life (years)     5 years  
Customer-related | Maximum        
Finite-Lived Intangible Assets [Line Items]        
Estimated Useful Life (years)     13 years  
Supplier-related        
Finite-Lived Intangible Assets [Line Items]        
Estimated Useful Life (years)     10 years  
Gross Carrying Amount     $ 1.5 0.0
Accumulated Amortization     (0.1) 0.0
Net Carrying Amount     1.4 0.0
Trademarks and trade names        
Finite-Lived Intangible Assets [Line Items]        
Gross Carrying Amount     22.2 21.0
Accumulated Amortization     (5.7) (1.7)
Net Carrying Amount     $ 16.5 19.3
Trademarks and trade names | Minimum        
Finite-Lived Intangible Assets [Line Items]        
Estimated Useful Life (years)     2 years  
Trademarks and trade names | Maximum        
Finite-Lived Intangible Assets [Line Items]        
Estimated Useful Life (years)     10 years  
Below-market leases        
Finite-Lived Intangible Assets [Line Items]        
Gross Carrying Amount     $ 0.7 0.7
Accumulated Amortization     (0.3) (0.1)
Net Carrying Amount     $ 0.4 0.6
Below-market leases | Minimum        
Finite-Lived Intangible Assets [Line Items]        
Estimated Useful Life (years)     1 year  
Below-market leases | Maximum        
Finite-Lived Intangible Assets [Line Items]        
Estimated Useful Life (years)     7 years  
Non-compete agreements        
Finite-Lived Intangible Assets [Line Items]        
Gross Carrying Amount     $ 4.0 0.0
Accumulated Amortization     (0.3) 0.0
Net Carrying Amount     $ 3.7 $ 0.0
Non-compete agreements | Minimum        
Finite-Lived Intangible Assets [Line Items]        
Estimated Useful Life (years)     3 years  
Non-compete agreements | Maximum        
Finite-Lived Intangible Assets [Line Items]        
Estimated Useful Life (years)     10 years  
Asset purchase - acquired intangibles | Minimum        
Finite-Lived Intangible Assets [Line Items]        
Estimated Useful Life (years)   10 years    
Asset purchase - acquired intangibles | Maximum        
Finite-Lived Intangible Assets [Line Items]        
Estimated Useful Life (years)   13 years