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Intangible Assets
 9 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The gross carrying amount and accumulated amortization for intangible assets as of September 30, 2025 consisted of the following (in millions):
 September 30, 2025
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Amortized Intangible Assets
Customer relationships$756.2 $300.6 $455.6 
Acquired and developed technology93.2 57.0 36.2 
Trade names49.4 12.4 37.0 
Non-compete agreements2.9 2.9 — 
Patents1.9 1.8 0.1 
Total$903.6 $374.7 $528.9 

The gross carrying amount and accumulated amortization for intangible assets as of December 31, 2024 consisted of the following (in millions):
 December 31, 2024
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Amortized Intangible Assets
Customer relationships$726.6 $254.3 $472.3 
Acquired and developed technology90.3 47.9 42.4 
Trade names47.2 9.4 37.8 
Non-compete agreements2.9 2.9 — 
Patents1.9 1.0 0.9 
Total
$868.9 $315.5 $553.4 
Amortization expense of intangible assets was $16.0 million and $15.4 million for the three months ended September 30, 2025 and 2024, respectively, and $47.3 million and $46.9 million for the nine months ended September 30, 2025 and 2024, respectively. Intangibles are expensed using the straight-line amortization method.