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Goodwill and Intangible Assets
 6 Months Ended
Jun. 30, 2023
Property, Plant and Equipment [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible AssetsComputer Software and Goodwill:
Computer softwareGoodwill
January 1, 2023$631.8 $3,431.3 
Additions at cost (1)
44.0 — 
Amortization(34.9)— 
Impairment / Write-off(0.3)— 
Other (2)
2.2 4.4 
March 31, 2023$642.8 $3,435.7 
Additions at cost (1)
52.2 — 
Amortization(37.4)— 
Impairment / Write-off(0.9)— 
Other (2)
— (13.3)
June 30, 2023$656.7 $3,422.4 
January 1, 2022$557.4 $3,493.3 
Additions at cost (1)
43.4 — 
Amortization(30.3)— 
Other (2)
(7.1)(17.9)
March 31, 2022$563.4 $3,475.4 
Additions at cost (1)
61.9 — 
Amortization(31.8)— 
Other (2)
(14.6)(38.3)
June 30, 2022$578.9 $3,437.1 

Other Intangibles:
Customer relationshipsReacquired rightsDatabaseOther indefinite-lived intangiblesOther intangiblesTotal
January 1, 2023$1,536.7 $245.5 $1,100.0 $1,280.0 $157.9 $4,320.1 
Additions at cost— — — — 0.1 0.1 
Amortization(56.8)(4.7)(41.0)— (4.2)(106.7)
Other (2)
1.1 2.8 0.1 — 1.1 5.1 
March 31, 2023$1,481.0 $243.6 $1,059.1 $1,280.0 $154.9 $4,218.6 
Additions at cost— — — — 0.1 0.1 
Amortization(55.1)(4.8)(39.8)— (4.2)(103.9)
Other (2)
(1.5)— (1.7)— 1.7 (1.5)
June 30, 2023$1,424.4 $238.8 $1,017.6 $1,280.0 $152.5 $4,113.3 
January 1, 2022$1,793.3 $284.7 $1,285.1 $1,280.0 $181.4 $4,824.5 
Additions at cost— — — — 0.2 0.2 
Amortization(61.9)(5.1)(44.6)— (4.2)(115.8)
Other (2)
(4.7)(7.9)(4.6)— (2.0)(19.2)
March 31, 2022$1,726.7 $271.7 $1,235.9 $1,280.0 $175.4 $4,689.7 
Additions at cost— — — — 0.2 0.2 
Amortization(59.7)(4.7)(43.2)— (4.4)(112.0)
Other (2)
(9.6)(15.7)(5.9)— (5.0)(36.2)
June 30, 2022$1,657.4 $251.3 $1,186.8 $1,280.0 $166.2 $4,541.7 
(1)Primarily related to software-related enhancements on products and purchased software.
(2)Primarily due to the impact of foreign currency fluctuations.