Goodwill and Other Intangible Assets (Schedule of Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,371,418	$ 1,150,025
Accumulated Amortization	912,936	820,776
Intangible assets, net	458,482	329,249
Customer Lists
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	636,410	494,615
Accumulated Amortization	360,598	312,044
Purchased software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	396,508	354,228
Accumulated Amortization	346,381	337,811
Internal use software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	233,438	207,696
Accumulated Amortization	150,356	123,280
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	52,883	42,951
Accumulated Amortization	33,719	28,961
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	52,179	50,535
Accumulated Amortization	$ 21,882	$ 18,680