v2.4.0.6
Goodwill and Other Intangible Assets, Net (Details 1) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Finite-lived Intangible Assets [Roll Forward]    
Gross Intangible Assets, Beginning Balance $ 692.9  
Acquisitions 1.0  
Gross Intangible Assets, Ending Balance 693.9  
Accumulated Amortization, Beginning Balance (334.2)  
Additions Charged to Expense (16.6)  
Accumulated Amortization, Ending Balance (350.8)  
Net Intangibles 343.1 358.7
Customer relationships, franchise and other municipal agreements [Member]
    
Finite-lived Intangible Assets [Roll Forward]    
Gross Intangible Assets, Beginning Balance 579.0  
Acquisitions 0.5  
Gross Intangible Assets, Ending Balance 579.5  
Accumulated Amortization, Beginning Balance (252.4)  
Additions Charged to Expense (14.2)  
Accumulated Amortization, Ending Balance (266.6)  
Net Intangibles 312.9  
Trade names [Member]
    
Finite-lived Intangible Assets [Roll Forward]    
Gross Intangible Assets, Beginning Balance 30.0  
Acquisitions 0  
Gross Intangible Assets, Ending Balance 30.0  
Accumulated Amortization, Beginning Balance (24.5)  
Additions Charged to Expense (1.5)  
Accumulated Amortization, Ending Balance (26.0)  
Net Intangibles 4.0  
Non-compete agreements [Member]
    
Finite-lived Intangible Assets [Roll Forward]    
Gross Intangible Assets, Beginning Balance 20.4  
Acquisitions 0.5  
Gross Intangible Assets, Ending Balance 20.9  
Accumulated Amortization, Beginning Balance (12.0)  
Additions Charged to Expense (0.7)  
Accumulated Amortization, Ending Balance (12.7)  
Net Intangibles 8.2  
Other intangibles assets [Member]
    
Finite-lived Intangible Assets [Roll Forward]    
Gross Intangible Assets, Beginning Balance 63.5  
Acquisitions 0  
Gross Intangible Assets, Ending Balance 63.5  
Accumulated Amortization, Beginning Balance (45.3)  
Additions Charged to Expense (0.2)  
Accumulated Amortization, Ending Balance (45.5)  
Net Intangibles $ 18.0