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Intangible Assets - Schedule of Identifiable Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 1,948.1 $ 2,101.0
Accumulated Amortization 310.6 224.5
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,867.4 2,017.0
Accumulated Amortization 251.1 174.4
Trade name    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 50.2 51.0
Accumulated Amortization 36.5 29.1
Non-compete agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 16.2 18.7
Accumulated Amortization 8.8 6.8
Carrier relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 12.1 12.1
Accumulated Amortization 12.1 12.1
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 2.2 2.2
Accumulated Amortization $ 2.1 $ 2.1