Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Intangible assets subject to amortization:
Gross Carrying Amount	$ 630.4	$ 603.6
Accumulated Amortization	357.8	358.3
Net Carrying Amount	272.6	245.3
Intangible assets not subject to amortization:
Trademarks, Carrying Amount	272.8	242.6
Intangible Assets, Gross (Excluding Goodwill)	903.2	846.2
Intangible Assets, Net (Excluding Goodwill), Total	545.4	487.9
Customer and Contractual Relationships
Intangible assets subject to amortization:
Accumulated Amortization	299.7	260.2
Net Carrying Amount	256.2	233.7
Total
Other Finite-Lived Intangible Assets, Gross	$ 555.9	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	$ 0.0	45.5
Net Carrying Amount	0.0	0.0
Total
Other Finite-Lived Intangible Assets, Gross	0.0	45.5
Backlog
Intangible assets subject to amortization:
Accumulated Amortization	33.8	31.0
Net Carrying Amount	1.0	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	$ 24.3	21.6
Net Carrying Amount	15.4	7.8
Total
Other Finite-Lived Intangible Assets, Gross	$ 39.7	$ 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