Goodwill and Identifiable Assets Acquired Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Intangible assets subject to amortization:
Gross Carrying Amount	$ 603.6	$ 529.8
Accumulated Amortization	358.3	302.5
Net Carrying Amount	245.3	227.3
Intangible assets not subject to amortization:
Trademarks, Carrying Amount	242.6	242.6
Gross Carrying Amount	846.2	772.4
Net Carrying Amount	487.9	469.9
Contractual customer relationships
Intangible assets subject to amortization:
Gross Carrying Amount	493.9	428.0
Accumulated Amortization	260.2	211.3
Net Carrying Amount	$ 233.7	216.7
Contractual customer relationships | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life (in years)	7 years
Contractual customer relationships | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life (in years)	13 years
Contractor relations
Intangible Assets [Line Items]
Estimated Useful Life (in years)	4 years
Intangible assets subject to amortization:
Gross Carrying Amount	$ 45.5	45.5
Accumulated Amortization	45.5	45.3
Net Carrying Amount	0.0	0.2
Backlog
Intangible assets subject to amortization:
Gross Carrying Amount	34.8	29.3
Accumulated Amortization	31.0	28.5
Net Carrying Amount	$ 3.8	0.8
Backlog | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life (in years)	1 year
Backlog | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life (in years)	3 years
Non-compete agreements
Intangible assets subject to amortization:
Gross Carrying Amount	$ 29.4	27.0
Accumulated Amortization	21.6	17.4
Net Carrying Amount	$ 7.8	$ 9.6
Non-compete agreements | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life (in years)	1 year
Non-compete agreements | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life (in years)	7 years