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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Rollforward of Goodwill by Reportable Segment
The following table provides a reconciliation of changes in goodwill by reportable segment for the periods indicated (in millions):
Communications
Clean Energy and Infrastructure
Oil and GasElectrical TransmissionTotal Goodwill
Goodwill, gross, as of December 31, 2018$467.8 $143.1 $455.6 $149.9 $1,216.4 
Accumulated impairment loss (a)
— — (116.0)— (116.0)
Goodwill, net, as of December 31, 2018$467.8 $143.1 $339.6 $149.9 $1,100.4 
Additions from new business combinations73.2 9.5 37.7 — 120.4 
Measurement period adjustments, net (b)
0.3 — (0.4)— (0.1)
Currency translation adjustments— — 0.7 — 0.7 
Goodwill, net, as of December 31, 2019$541.3 $152.6 $377.6 $149.9 $1,221.4 
Additions from new business combinations14.9 — — 0.2 15.1 
Measurement period adjustments, net (b)
5.9 0.1 0.1 — 6.1 
Currency translation adjustments— — 0.4 — 0.4 
Goodwill, net, as of December 31, 2020$562.1 $152.7 $378.1 $150.1 $1,243.0 
Accumulated impairment loss (a)
— — (123.8)— (123.8)
Goodwill, gross, as of December 31, 2020$562.1 $152.7 $501.9 $150.1 $1,366.8 
(a)    Accumulated impairment losses include the effects of currency translation gains and/or losses.
(b)    Represents adjustments to preliminary estimates of fair value within the measurement period of up to one year from the date of acquisition.
Rollforward of Other Intangible Assets
The following table provides a reconciliation of changes in other intangible assets, net, for the periods indicated (in millions):
Other Intangible Assets
Non-AmortizingAmortizing
Trade NamesPre-QualificationsCustomer Relationships and BacklogPre-Qualifications
Other (a)
Total
Other intangible assets, gross, as of December 31, 2018$34.5 $74.0 $224.4 $— $21.1 $354.0 
Accumulated amortization
(170.0)— (14.6)(184.6)
Other intangible assets, net, as of December 31, 2018$34.5 $74.0 $54.4 $— $6.5 $169.4 
Additions from new business combinations— 0.2 67.7 — 5.2 73.1 
Measurement period adjustments (b)
— — (6.7)— (0.2)(6.9)
Intangible asset impairment— (3.3)— — — (3.3)
Currency translation adjustments— 2.0 0.1 — 0.1 2.2 
Amortization expense(20.2)— (2.8)(23.0)
Other intangible assets, net, as of December 31, 2019$34.5 $72.9 $95.3 $— $8.8 $211.5 
Additions from new business combinations— — 11.0 — 0.1 11.1 
Classification changes (c)
— (69.8)— 69.8 — — 
Measurement period adjustments (b)
— — (0.2)— — (0.2)
Currency translation adjustments— (3.1)— 3.6 — 0.5 
Amortization expense(26.7)(10.2)(2.0)(38.9)
Other intangible assets, net, as of December 31, 2020$34.5 $— $79.4 $63.2 $6.9 $184.0 
Remaining weighted average amortization period
(in years)		911610
(a)    Consists principally of trade names and non-compete agreements.
(b)    Represents adjustments to preliminary estimates of fair value within the measurement period of up to one year from the date of acquisition.
(c)    In connection with its first quarter 2020 assessment of goodwill and indefinite-lived intangible assets, management reassessed the indefinite-life classification of its two pre-qualification intangible assets. Management determined that, based on changes in the assets’ characteristics, including current and expected changes in the customer mix of the associated reporting units, a finite-life classification for these assets was more appropriate. As a result, the Company changed the classification of these intangible assets from indefinite-lived to finite-lived and began amortizing them on an accelerated basis in the first quarter of 2020, at which time their estimated remaining weighted average useful life was approximately 12 years.
Schedule of Expected Future Amortization Expense Expected future amortization expense as of December 31, 2020 is summarized in the following table (in millions):
Amortization Expense
2021$31.7 
202225.4 
202319.7 
202415.3 
202511.7 
Thereafter45.7 
Total
$149.5 
Schedule of Consideration Paid and Net Assets Acquired, Business Combinations
The following table summarizes the fair values of consideration paid and net assets acquired for the 2019 acquisitions as of the respective dates of acquisition, as adjusted (in millions):
Acquisition consideration:2019
Cash, net of cash acquired and other$176.4 
Estimated fair value of contingent consideration and other liabilities40.1 
Total consideration transferred$216.5 
Identifiable assets acquired and liabilities assumed:
Current assets, primarily composed of accounts receivable$92.6 
Property and equipment, including finance leases and other long-term assets56.1 
Amortizing intangible assets65.9 
Current liabilities, including current portion of finance lease obligations and long-term debt(89.0)
Long-term debt, including finance lease obligations(2.4)
Deferred income taxes and other long-term liabilities(27.5)
Total identifiable net assets$95.7 
Goodwill$120.8 
Total net assets acquired, including goodwill$216.5