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Business Combination Intangible Assets (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Aug. 01, 2016
Acquired Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Customer Relationships, Gross     $ 22.0
Finite-Lived Trade Names, Gross     0.7
Finite-Lived Intangible Assets, Gross $ 547.8 $ 541.8 $ 22.7
Customer Relationships [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 479.8 474.0  
Customer Relationships [Member] | buw Acquisition [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 10 years    
Trade Names [Member] | buw Acquisition [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 1 year    
Trademarks [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Assets, Gross $ 26.7 $ 26.5  
Maximum [Member] | Customer Relationships [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 17 years    
Maximum [Member] | Trademarks [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 4 years    
Minimum [Member] | Customer Relationships [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 1 year    
Minimum [Member] | Trademarks [Member]      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 1 year