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Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Intangible assets subject to amortization:    
Gross Carrying Amount $ 603.3 $ 603.6
Accumulated Amortization 385.4 358.3
Net Carrying Amount 217.9 245.3
Intangible assets not subject to amortization:    
Trademarks, Carrying Amount 242.6 242.6
Intangible Assets, Gross (Excluding Goodwill) 845.9 846.2
Intangible Assets, Net (Excluding Goodwill), Total 460.5 487.9
Customer and Contractual Relationships    
Intangible assets subject to amortization:    
Accumulated Amortization 283.8 260.2
Net Carrying Amount 209.8 233.7
Total    
Other Finite-Lived Intangible Assets, Gross $ 493.6 493.9
Customer and Contractual Relationships | Minimum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 7 years  
Customer and Contractual Relationships | Maximum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 13 years  
Contractor Relations    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 4 years  
Intangible assets subject to amortization:    
Accumulated Amortization $ 45.5 45.5
Net Carrying Amount 0.0 0.0
Total    
Other Finite-Lived Intangible Assets, Gross 45.5 45.5
Backlog    
Intangible assets subject to amortization:    
Accumulated Amortization 32.9 31.0
Net Carrying Amount 1.9 3.8
Total    
Other Finite-Lived Intangible Assets, Gross $ 34.8 34.8
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 3 years  
Noncompete Agreements    
Intangible assets subject to amortization:    
Accumulated Amortization $ 23.2 21.6
Net Carrying Amount 6.2 7.8
Total    
Other Finite-Lived Intangible Assets, Gross $ 29.4 $ 29.4
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