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Goodwill and Other Intangible Assets (Rollforward of Other Intangible Assets) (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2018
Other Intangible Assets [Line Items] |  |  |  |  |  |  |
Other intangible assets, gross |  |  |  |  |  |  | $ 354,000,000.0
Accumulated amortization |  |  |  |  |  |  | (184,600,000)
Other Intangible Assets [Roll Forward] |  |  |  |  |  |  |
Other intangible assets, net, beginning balance |  | $ 211,528,000 |  | $ 211,528,000 | $ 169,400,000 |  |
Additions from new business combinations |  |  |  | 11,100,000 | 73,100,000 |  |
Intangible assets, gross (excluding goodwill), transfer in (out) |  |  |  | 0 |  |  |
Measurement period adjustments |  |  |  | (200,000) | (6,900,000) |  |
Intangible asset impairment, non-amortizing intangible assets |  |  |  |  | (3,300,000) | $ 0 |
Intangible asset impairment |  |  |  |  | (3,300,000) |  |
Amortization expense |  |  |  | (38,900,000) | (23,000,000.0) |  |
Currency translation adjustments |  |  |  | 500,000 | 2,200,000 |  |
Other intangible assets, net, amortizing, ending balance | $ 149,500,000 |  |  | 149,500,000 |  |  |
Other intangible assets, net, ending balance | $ 184,043,000 |  | $ 211,528,000 | 184,043,000 | 211,528,000 | 169,400,000 |
Weighted Average [Member] |  |  |  |  |  |  |
Other Intangible Assets [Roll Forward] |  |  |  |  |  |  |
Remaining weighted average amortization period (in years) | 10 years |  |  |  |  |  |
Customer Relationships and Backlog [Member] |  |  |  |  |  |  |
Other Intangible Assets [Line Items] |  |  |  |  |  |  |
Other intangible assets, amortizing, gross |  |  |  |  |  |  | 224,400,000
Accumulated amortization |  |  |  |  |  |  | (170,000,000.0)
Other Intangible Assets [Roll Forward] |  |  |  |  |  |  |
Other intangible assets, net, amortizing, beginning balance |  | 95,300,000 |  | 95,300,000 | 54,400,000 |  |
Additions from new business combinations, amortizing intangible assets |  |  |  | 11,000,000.0 | 67,700,000 |  |
Finite-lived intangible assets, transfer in (out) |  |  |  | 0 |  |  |
Measurement period adjustments, amortizing intangible assets |  |  |  | (200,000) | (6,700,000) |  |
Intangible asset impairment, amortizing intangible assets |  |  |  |  | 0 |  |
Amortization expense |  |  |  | (26,700,000) | (20,200,000) |  |
Currency translation adjustments, amortizing intangible assets |  |  |  | 0 | 100,000 |  |
Other intangible assets, net, amortizing, ending balance | $ 79,400,000 |  | 95,300,000 | 79,400,000 | 95,300,000 | 54,400,000 |
Customer Relationships and Backlog [Member] | Weighted Average [Member] |  |  |  |  |  |  |
Other Intangible Assets [Roll Forward] |  |  |  |  |  |  |
Remaining weighted average amortization period (in years) | 9 years |  |  |  |  |  |
Other Amortizing Intangible Assets [Member] |  |  |  |  |  |  |
Other Intangible Assets [Line Items] |  |  |  |  |  |  |
Other intangible assets, amortizing, gross |  |  |  |  |  |  | 21,100,000
Accumulated amortization |  |  |  |  |  |  | (14,600,000)
Other Intangible Assets [Roll Forward] |  |  |  |  |  |  |
Other intangible assets, net, amortizing, beginning balance |  | 8,800,000 |  | 8,800,000 | 6,500,000 |  |
Additions from new business combinations, amortizing intangible assets |  |  |  | 100,000 | 5,200,000 |  |
Finite-lived intangible assets, transfer in (out) |  |  |  | 0 |  |  |
Measurement period adjustments, amortizing intangible assets |  |  |  | 0 | (200,000) |  |
Intangible asset impairment, amortizing intangible assets |  |  |  |  | 0 |  |
Amortization expense |  |  |  | (2,000,000.0) | (2,800,000) |  |
Currency translation adjustments, amortizing intangible assets |  |  |  | 0 | 100,000 |  |
Other intangible assets, net, amortizing, ending balance | $ 6,900,000 |  | 8,800,000 | 6,900,000 | 8,800,000 | 6,500,000 |
Other Amortizing Intangible Assets [Member] | Weighted Average [Member] |  |  |  |  |  |  |
Other Intangible Assets [Roll Forward] |  |  |  |  |  |  |
Remaining weighted average amortization period (in years) | 6 years |  |  |  |  |  |
Pre-Qualifications [Member] |  |  |  |  |  |  |
Other Intangible Assets [Line Items] |  |  |  |  |  |  |
Other intangible assets, amortizing, gross |  |  |  |  |  |  | 0
Accumulated amortization |  |  |  |  |  |  | 0
Other Intangible Assets [Roll Forward] |  |  |  |  |  |  |
Other intangible assets, net, amortizing, beginning balance |  | $ 0 |  | 0 | 0 |  |
Additions from new business combinations, amortizing intangible assets |  |  |  | 0 | 0 |  |
Finite-lived intangible assets, transfer in (out) |  |  |  | 69,800,000 |  |  |
Measurement period adjustments, amortizing intangible assets |  |  |  | 0 | 0 |  |
Intangible asset impairment, amortizing intangible assets |  |  |  |  | 0 |  |
Amortization expense |  |  |  | (10,200,000) | 0 |  |
Currency translation adjustments, amortizing intangible assets |  |  |  | 3,600,000 | 0 |  |
Other intangible assets, net, amortizing, ending balance | $ 63,200,000 |  | 0 | 63,200,000 | 0 | 0 |
Pre-Qualifications [Member] | Weighted Average [Member] |  |  |  |  |  |  |
Other Intangible Assets [Roll Forward] |  |  |  |  |  |  |
Remaining weighted average amortization period (in years) | 11 years | 12 years |  |  |  |  |
Trade Names [Member] |  |  |  |  |  |  |
Other Intangible Assets [Line Items] |  |  |  |  |  |  |
Other intangible assets, non-amortizing | $ 34,500,000 | $ 34,500,000 | 34,500,000 | 34,500,000 | 34,500,000 | 34,500,000 | 34,500,000
Other Intangible Assets [Roll Forward] |  |  |  |  |  |  |
Other intangible assets, non-amortizing, beginning balance |  | 34,500,000 |  | 34,500,000 | 34,500,000 |  |
Additions from new business combinations, non-amortizing intangible assets |  |  |  | 0 | 0 |  |
Indefinite-lived intangible assets, transfers in (out) |  |  |  | 0 |  |  |
Measurement period adjustments, non-amortizing intangible assets |  |  |  | 0 | 0 |  |
Intangible asset impairment, non-amortizing intangible assets |  |  |  |  | 0 |  |
Currency translation adjustments, non-amortizing intangible assets |  |  |  | 0 | 0 |  |
Other intangible assets, non-amortizing, ending balance | 34,500,000 |  | 34,500,000 | 34,500,000 | 34,500,000 | 34,500,000 |
Pre-Qualifications [Member] |  |  |  |  |  |  |
Other Intangible Assets [Line Items] |  |  |  |  |  |  |
Other intangible assets, non-amortizing | 0 | 72,900,000 | 72,900,000 | 0 | 72,900,000 | 74,000,000.0 | $ 74,000,000.0
Other Intangible Assets [Roll Forward] |  |  |  |  |  |  |
Other intangible assets, non-amortizing, beginning balance |  | $ 72,900,000 |  | 72,900,000 | 74,000,000.0 |  |
Additions from new business combinations, non-amortizing intangible assets |  |  |  | 0 | 200,000 |  |
Indefinite-lived intangible assets, transfers in (out) |  |  |  | (69,800,000) |  |  |
Measurement period adjustments, non-amortizing intangible assets |  |  |  | 0 | 0 |  |
Intangible asset impairment, non-amortizing intangible assets |  |  | (3,300,000) |  | (3,300,000) |  |
Currency translation adjustments, non-amortizing intangible assets |  |  |  | (3,100,000) | 2,000,000.0 |  |
Other intangible assets, non-amortizing, ending balance | $ 0 |  | $ 72,900,000 | $ 0 | $ 72,900,000 | $ 74,000,000.0 |

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