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Acquisitions (Details) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) item $ / shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) | Dec. 10, 2021 item | Oct. 01, 2021 item | Dec. 31, 2018 USD ($)
Acquisitions |  |  |  |  |  |
Net sales | $ 14,093.3 | $ 8,811.9 | $ 10,973.8 |  |  |
Number of states in which the company operates metal service center network | item | 40 |  |  |  |  |
Allocation of the total purchase price of the acquisitions to the fair value of the assets acquired and liabilities assumed |  |  |  |  |  |
Goodwill | $ 2,107.6 | 1,935.2 | $ 2,003.8 |  |  | $ 1,870.8
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |
Tax deductible goodwill amount | 852.6 |  |  |  |  |
Trade names |  |  |  |  |  |
Allocation of the total purchase price of the acquisitions to the fair value of the assets acquired and liabilities assumed |  |  |  |  |  |
Intangible assets not subject to amortization | 68.1 | 30.3 |  |  |  |
Production backlog |  |  |  |  |  |
Allocation of the total purchase price of the acquisitions to the fair value of the assets acquired and liabilities assumed |  |  |  |  |  |
Intangible assets subject to amortization | $ 15.8 |  |  |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |
Weighted average lives of identifiable intangible assets | 8 years |  |  |  |  |
Customer relationships |  |  |  |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |
Intangible assets acquired subject to amortization | $ 89.6 | $ 26.0 |  |  |  |
Weighted average lives of identifiable intangible assets |  | 10 years |  |  |  |
Admiral Metals Servicenter Company, Inc. |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Locations acquiree provides services from | item |  |  |  | 8 |  |
Merfish United Inc. |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Number of states in which the company operates metal service center network | item |  |  |  |  | 47 |
Locations acquiree provides services from | item |  |  |  |  | 12 |
Fry Steel |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Net sales | 92.1 |  |  |  |  |
Allocation of the total purchase price of the acquisitions to the fair value of the assets acquired and liabilities assumed |  |  |  |  |  |
Cash |  | $ 17.1 |  |  |  |
Accounts receivable |  | 5.7 |  |  |  |
Inventories |  | 39.3 |  |  |  |
Property, plant and equipment |  | 29.9 |  |  |  |
Goodwill |  | 60.5 |  |  |  |
Intangible assets subject to amortization |  | 26.0 |  |  |  |
Intangible assets not subject to amortization |  | 30.3 |  |  |  |
Other current and long-term assets |  | 0.3 |  |  |  |
Total assets acquired |  | 209.1 |  |  |  |
Current and long-term debt |  | 8.3 |  |  |  |
Total liabilities assumed |  | 8.3 |  |  |  |
Net assets acquired |  | 200.8 |  |  |  |
2019 Acquisitions |  |  |  |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |
Tax deductible goodwill amount |  | 60.8 |  |  |  |
2021 Acquisitions |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Net sales | 171.0 |  |  |  |  |
Transaction costs | 7.7 |  |  |  |  |
Allocation of the total purchase price of the acquisitions to the fair value of the assets acquired and liabilities assumed |  |  |  |  |  |
Cash | 1.0 |  |  |  |  |
Accounts receivable | 107.2 |  |  |  |  |
Inventories | 134.4 |  |  |  |  |
Property, plant and equipment | 32.6 |  |  |  |  |
Operating lease right-of-use assets | 29.8 |  |  |  |  |
Goodwill | 172.0 |  |  |  |  |
Intangible assets subject to amortization | 105.6 |  |  |  |  |
Intangible assets not subject to amortization | 68.1 |  |  |  |  |
Other current and long-term assets | 4.0 |  |  |  |  |
Total assets acquired | 654.7 |  |  |  |  |
Deferred taxes | 50.6 |  |  |  |  |
Operating lease liabilities | 24.6 |  |  |  |  |
Other current and long-term liabilities | 139.2 |  |  |  |  |
Total liabilities assumed | 214.4 |  |  |  |  |
Net assets acquired | 440.3 |  |  |  |  |
Pro forma financial information |  |  |  |  |  |
Non-recurring Inventory step-up amortization |  | 21.8 |  |  |  |
Non-recurring excess renumeration payments |  | 7.8 |  |  |  |
Non-recurring acquisition related costs |  | 7.7 |  |  |  |
Pro forma net income attributable to Reliance after non-recurring items |  | $ 387.7 |  |  |  |
Pro forma diluted earnings per share adjusted for non-recurring items | $ / shares |  | $ 5.91 |  |  |  |
Pro forma: |  |  |  |  |  |
Net sales | 14,820.5 | $ 9,345.4 |  |  |  |
Net income attributable to Reliance | $ 1,519.1 | $ 357.7 |  |  |  |
Diluted earnings per common share attributable to Reliance shareholders (in dollars per share) | $ / shares | $ 23.62 | $ 5.48 |  |  |  |
Basic earnings per common share attributable to Reliance shareholders (in dollars per share) | $ / shares | $ 24.03 | $ 5.56 |  |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |
Tax deductible goodwill amount | $ 104.5 |  |  |  |  |
2021 Acquisitions | Trade names |  |  |  |  |  |
Allocation of the total purchase price of the acquisitions to the fair value of the assets acquired and liabilities assumed |  |  |  |  |  |
Intangible assets not subject to amortization | $ 68.1 |  |  |  |  |

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