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Goodwill and Other Intangible Assets, Net - Other Intangible Assets, Net (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Gross Intangible Assets    
Beginning balance $ 837.3  
Acquisitions 1.8  
Adjustments and Other (0.9)  
Ending balance 838.2  
Accumulated Amortization    
Beginning balance (703.4)  
Additions Charged to Expense (5.3)  
Adjustments and Other 0.5  
Ending balance (708.2)  
Other Intangible Assets, Net 130.0 $ 133.9
Customer relationships, franchise and other municipal agreements    
Gross Intangible Assets    
Beginning balance 733.8  
Acquisitions 0.7  
Adjustments and Other 0.0  
Ending balance 734.5  
Accumulated Amortization    
Beginning balance (623.0)  
Additions Charged to Expense (4.2)  
Adjustments and Other 0.0  
Ending balance (627.2)  
Other Intangible Assets, Net 107.3  
Non-compete agreements    
Gross Intangible Assets    
Beginning balance 45.3  
Acquisitions 1.1  
Adjustments and Other (0.2)  
Ending balance 46.2  
Accumulated Amortization    
Beginning balance (35.3)  
Additions Charged to Expense (0.9)  
Adjustments and Other 0.1  
Ending balance (36.1)  
Other Intangible Assets, Net 10.1  
Other intangible assets    
Gross Intangible Assets    
Beginning balance 58.2  
Acquisitions 0.0  
Adjustments and Other (0.7)  
Ending balance 57.5  
Accumulated Amortization    
Beginning balance (45.1)  
Additions Charged to Expense (0.2)  
Adjustments and Other 0.4  
Ending balance (44.9)  
Other Intangible Assets, Net $ 12.6