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Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Intangible Assets [Line Items]    
Write-off Intangible Asset $ 3.3  
Intangible assets subject to amortization:    
Gross Carrying Amount 500.6 $ 483.5
Accumulated Amortization 294.6 257.0
Net Carrying Amount 206.0 226.5
Intangible assets not subject to amortization:    
Trademarks, Carrying Amount 258.9 [1] 262.2
Intangible Assets, Gross (Excluding Goodwill) 759.5 745.7
Intangible Assets, Net (Excluding Goodwill) 464.9 488.7
Customer and Contractual Relationships    
Intangible assets subject to amortization:    
Gross Carrying Amount 362.1 346.9
Accumulated Amortization 170.7 145.4
Net Carrying Amount $ 191.4 201.5
Customer and Contractual Relationships | Minimum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 2 months  
Customer and Contractual Relationships | Maximum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 12 years 9 months  
Contractor Relations    
Intangible assets subject to amortization:    
Gross Carrying Amount $ 71.0 71.1
Accumulated Amortization 70.5 67.1
Net Carrying Amount $ 0.5 4.0
Contractor Relations | Minimum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 2 years  
Contractor Relations | Maximum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 5 years  
Backlog    
Intangible assets subject to amortization:    
Gross Carrying Amount $ 25.0 23.1
Accumulated Amortization 22.3 17.7
Net Carrying Amount $ 2.7 5.4
Backlog | Minimum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 1 year  
Backlog | Maximum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 2 years 9 months  
Noncompete Agreements    
Intangible assets subject to amortization:    
Gross Carrying Amount $ 23.6 22.1
Accumulated Amortization 12.8 9.9
Net Carrying Amount $ 10.8 12.2
Noncompete Agreements | Minimum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 2 years  
Noncompete Agreements | Maximum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 7 years  
In-use software    
Intangible assets subject to amortization:    
Gross Carrying Amount $ 18.9 18.9
Accumulated Amortization 18.3 16.0
Net Carrying Amount $ 0.6 2.9
In-use software | Minimum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 6 years  
Favorable Contracts    
Intangible assets subject to amortization:    
Gross Carrying Amount $ 0.0 1.4
Accumulated Amortization 0.0 0.9
Net Carrying Amount $ 0.0 $ 0.5
Favorable Contracts | Minimum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 5 years  
[1] Certain foreign trademarks totaling $3.3 million were written off during the second quarter of 2019.