Acquisitions, Goodwill and Other Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($) $ in Millions |
9 Months Ended | 12 Months Ended |
---|---|---|
Sep. 30, 2021 |
Dec. 31, 2020 |
|
Finite-Lived Intangible Assets [Line Items] | ||
Gross | $ 730.2 | $ 722.4 |
Accumulated Amortization | (386.0) | (342.3) |
Total | $ 344.2 | $ 380.1 |
Weighted-Average Useful Life (years) | 10 years | 10 years |
Customer-related assets | ||
Finite-Lived Intangible Assets [Line Items] | ||
Gross | $ 414.1 | $ 415.6 |
Accumulated Amortization | (185.3) | (163.7) |
Total | $ 228.8 | $ 251.9 |
Weighted-Average Useful Life (years) | 11 years | 11 years |
Technology-based assets | ||
Finite-Lived Intangible Assets [Line Items] | ||
Gross | $ 233.1 | $ 223.2 |
Accumulated Amortization | (152.3) | (135.2) |
Total | $ 80.8 | $ 88.0 |
Weighted-Average Useful Life (years) | 7 years | 7 years |
Intellectual property & other | ||
Finite-Lived Intangible Assets [Line Items] | ||
Gross | $ 83.0 | $ 83.6 |
Accumulated Amortization | (48.4) | (43.4) |
Total | $ 34.6 | $ 40.2 |
Weighted-Average Useful Life (years) | 8 years | 8 years |