Goodwill and Other Intangible Assets - Intangible Assets by Asset Type (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,305.0	$ 4,230.8
Accumulated Amortization	(2,935.3)	(2,740.1)
Net Carrying Amount	1,369.7	1,490.7
Customer relationships
Intangible Assets [Line Items]
Gross Carrying Amount	3,379.7	3,352.4
Accumulated Amortization	(2,236.6)	(2,100.6)
Net Carrying Amount	1,143.1	$ 1,251.8
Trade name
Intangible Assets [Line Items]
Useful Life (Years)		20 years
Gross Carrying Amount	446.1	$ 446.1
Accumulated Amortization	(366.6)	(341.0)
Net Carrying Amount	79.5	105.1
Internally developed software
Intangible Assets [Line Items]
Gross Carrying Amount	474.9	429.8
Accumulated Amortization	(330.6)	(297.6)
Net Carrying Amount	144.3	132.2
Other
Intangible Assets [Line Items]
Gross Carrying Amount	4.3	2.5
Accumulated Amortization	(1.5)	(0.9)
Net Carrying Amount	$ 2.8	$ 1.6
Minimum | Customer relationships
Intangible Assets [Line Items]
Useful Life (Years)	3 years	3 years
Minimum | Trade name
Intangible Assets [Line Items]
Useful Life (Years)	1 year	1 year
Minimum | Internally developed software
Intangible Assets [Line Items]
Useful Life (Years)	3 years	3 years
Minimum | Other
Intangible Assets [Line Items]
Useful Life (Years)	1 year	1 year
Maximum | Customer relationships
Intangible Assets [Line Items]
Useful Life (Years)	14 years	14 years
Maximum | Trade name
Intangible Assets [Line Items]
Useful Life (Years)	20 years
Maximum | Internally developed software
Intangible Assets [Line Items]
Useful Life (Years)	5 years	5 years
Maximum | Other
Intangible Assets [Line Items]
Useful Life (Years)	10 years	10 years