Goodwill and Other Intangible Assets, Net (Finite-lived Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finite-lived Intangible Assets
Gross Intangible Assets, Beginning Balance	$ 897.0	$ 837.3
Gross Intangible Assets, Acquisitions	102.0	60.7
Gross Intangible Assets, Divestitures	17.8	(1.0)
Gross Intangible Assets, Ending Balance	1,016.8	897.0
Accumulated Amortization, Beginning Balance	(723.9)	(703.4)
Accumulated Amortization, Additions Charged to Expense	(33.4)	(21.1)
Accumulated Amortization, Divestitures	0.0	0.6
Accumulated Amortization, Ending Balance	(757.3)	(723.9)
Other Intangible Assets, Net, Total	259.5	173.1
Customer relationships
Finite-lived Intangible Assets
Gross Intangible Assets, Beginning Balance	788.1	733.8
Gross Intangible Assets, Acquisitions	92.3	54.4
Gross Intangible Assets, Divestitures	18.0	(0.1)
Gross Intangible Assets, Ending Balance	898.4	788.1
Accumulated Amortization, Beginning Balance	(639.5)	(623.0)
Accumulated Amortization, Additions Charged to Expense	(27.3)	(16.6)
Accumulated Amortization, Divestitures	0.0	0.1
Accumulated Amortization, Ending Balance	(666.8)	(639.5)
Other Intangible Assets, Net, Total	231.6	148.6
Non-compete agreements
Finite-lived Intangible Assets
Gross Intangible Assets, Beginning Balance	51.4	45.3
Gross Intangible Assets, Acquisitions	9.2	6.3
Gross Intangible Assets, Divestitures	(0.2)	(0.2)
Gross Intangible Assets, Ending Balance	60.4	51.4
Accumulated Amortization, Beginning Balance	(39.1)	(35.3)
Accumulated Amortization, Additions Charged to Expense	(5.5)	(3.9)
Accumulated Amortization, Divestitures	0.0	0.1
Accumulated Amortization, Ending Balance	(44.6)	(39.1)
Other Intangible Assets, Net, Total	15.8	12.3
Other intangible assets
Finite-lived Intangible Assets
Gross Intangible Assets, Beginning Balance	57.5	58.2
Gross Intangible Assets, Acquisitions	0.5	0.0
Gross Intangible Assets, Divestitures	0.0	(0.7)
Gross Intangible Assets, Ending Balance	58.0	57.5
Accumulated Amortization, Beginning Balance	(45.3)	(45.1)
Accumulated Amortization, Additions Charged to Expense	(0.6)	(0.6)
Accumulated Amortization, Divestitures	0.0	0.4
Accumulated Amortization, Ending Balance	(45.9)	(45.3)
Other Intangible Assets, Net, Total	$ 12.1	$ 12.2