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Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Intangible assets subject to amortization:    
Gross Carrying Amount $ 559.4 $ 529.8
Accumulated Amortization 326.5 302.5
Net Carrying Amount 232.9 227.3
Intangible assets not subject to amortization:    
Trademarks, Carrying Amount 242.6 242.6
Intangible Assets, Gross (Excluding Goodwill) 802.0 772.4
Intangible Assets, Net (Excluding Goodwill), Total 475.5 469.9
Customer and Contractual Relationships    
Intangible assets subject to amortization:    
Accumulated Amortization 232.6 211.3
Net Carrying Amount 224.8 216.7
Total    
Other Finite-Lived Intangible Assets, Gross $ 457.4 428.0
Customer and Contractual Relationships | Minimum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 7 years 3 months 18 days  
Customer and Contractual Relationships | Maximum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 12 years 9 months 18 days  
Contractor Relations    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 4 years  
Intangible assets subject to amortization:    
Accumulated Amortization $ 45.4 45.3
Net Carrying Amount 0.1 0.2
Total    
Other Finite-Lived Intangible Assets, Gross 45.5 45.5
Backlog    
Intangible assets subject to amortization:    
Accumulated Amortization 28.9 28.5
Net Carrying Amount 0.4 0.8
Total    
Other Finite-Lived Intangible Assets, Gross $ 29.3 29.3
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 18 days  
Noncompete Agreements    
Intangible assets subject to amortization:    
Accumulated Amortization $ 19.6 17.4
Net Carrying Amount 7.6 9.6
Total    
Other Finite-Lived Intangible Assets, Gross $ 27.2 $ 27.0
Noncompete Agreements | Minimum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 1 year  
Noncompete Agreements | Maximum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 7 years