Goodwill and Other Intangible Assets - Intangible Assets by Asset Type (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,354.9	$ 4,305.0
Accumulated Amortization	(2,998.3)	(2,935.3)
Net Carrying Amount	1,356.6	1,369.7
Customer relationships
Intangible Assets [Line Items]
Gross Carrying Amount	3,478.1	3,379.7
Accumulated Amortization	(2,361.6)	(2,236.6)
Net Carrying Amount	1,116.5	$ 1,143.1
Trade name
Intangible Assets [Line Items]
Useful Lives (Years)		20 years
Gross Carrying Amount	449.6	$ 446.1
Accumulated Amortization	(387.6)	(366.6)
Net Carrying Amount	62.0	79.5
Internally developed software
Intangible Assets [Line Items]
Gross Carrying Amount	391.6	474.9
Accumulated Amortization	(246.9)	(330.6)
Net Carrying Amount	144.7	144.3
Other
Intangible Assets [Line Items]
Gross Carrying Amount	35.6	4.3
Accumulated Amortization	(2.2)	(1.5)
Net Carrying Amount	$ 33.4	$ 2.8
Minimum | Customer relationships
Intangible Assets [Line Items]
Useful Lives (Years)	3 years	3 years
Minimum | Trade name
Intangible Assets [Line Items]
Useful Lives (Years)	1 year	1 year
Minimum | Internally developed software
Intangible Assets [Line Items]
Useful Lives (Years)	3 years	3 years
Minimum | Other
Intangible Assets [Line Items]
Useful Lives (Years)	1 year	1 year
Maximum | Customer relationships
Intangible Assets [Line Items]
Useful Lives (Years)	14 years	14 years
Maximum | Trade name
Intangible Assets [Line Items]
Useful Lives (Years)	20 years
Maximum | Internally developed software
Intangible Assets [Line Items]
Useful Lives (Years)	5 years	5 years
Maximum | Other
Intangible Assets [Line Items]
Useful Lives (Years)	10 years	10 years