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Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Intangible assets subject to amortization:    
Other Finite-Lived Intangible Assets, Gross $ 674.6 $ 674.6
Accumulated Amortization 395.9 377.8
Net Carrying Amount 278.7 296.8
Intangible assets not subject to amortization:    
Trademarks, Carrying Amount 272.8 272.8
Intangible Assets, Gross (Excluding Goodwill) 947.4 947.4
Intangible Assets, Net (Excluding Goodwill), Total 551.5 569.6
Customer and Contractual Relationships    
Intangible assets subject to amortization:    
Other Finite-Lived Intangible Assets, Gross 589.3 589.3
Accumulated Amortization 330.8 315.7
Net Carrying Amount $ 258.5 273.6
Customer and Contractual Relationships | Minimum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 1 year  
Customer and Contractual Relationships | Maximum [Member]    
Intangible Assets [Line Items]    
Finite-Lived Intangible Asset, Useful Life 13 years  
Backlog    
Intangible assets subject to amortization:    
Other Finite-Lived Intangible Assets, Gross $ 44.1 44.1
Accumulated Amortization 38.4 36.5
Net Carrying Amount $ 5.7 7.6
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:    
Other Finite-Lived Intangible Assets, Gross $ 41.2 41.2
Accumulated Amortization 26.7 25.6
Net Carrying Amount $ 14.5 $ 15.6
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