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Acquisitions (Details) $ in Millions | 3 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) item | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) item | Dec. 31, 2016 USD ($) item | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Jan. 01, 2016 location | Aug. 01, 2014 country item location | Dec. 31, 2013 USD ($)
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 2,061.6 | $ 2,185.2 | $ 2,203.9 | $ 2,162.7 | $ 2,026.2 | $ 2,286.2 | $ 2,423.7 | $ 2,614.4 |  |  | $ 8,613.4 | $ 9,350.5 | $ 10,451.6 |  |  |
Number of countries of the acquiree entity | item | 12 |  |  |  |  |  |  |  | 12 | 12 | 12 |  |  |  |  |
Proceeds from sale of business, net |  |  |  |  |  |  |  |  |  |  |  |  | 26.2 |  |  |
Allocation of the total purchase price of the acquisitions to the fair value of the assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 1,827.4 |  |  |  | $ 1,724.8 |  |  |  | $ 1,827.4 | $ 1,827.4 | $ 1,827.4 | $ 1,724.8 | 1,736.4 |  |  | $ 1,691.6
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax deductible goodwill amount | 662.5 |  |  |  |  |  |  |  | 662.5 | 662.5 | 662.5 |  |  |  |  |
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 | 38.2 |  |  |  |  |  |  |  | 38.2 | 38.2 | 38.2 |  | 39.0 |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets not subject to amortization | 38.2 |  |  |  |  |  |  |  | 38.2 | 38.2 | 38.2 |  | 39.0 |  |  |
Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired subject to amortization |  |  |  |  |  |  |  |  |  |  | $ 76.8 |  | $ 37.3 |  |  |
Weighted average lives of identifiable intangible assets |  |  |  |  |  |  |  |  |  |  | 15 years 6 months |  | 13 years 7 months 6 days |  |  |
Unsecured revolving credit facility due September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity of the revolving credit facility |  | $ 1,500.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alaska Steel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 8.5 |  |  |  |  |  |  |
Best Manufacturing |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 13.8 |  |  |  |  |  |
Tubular Steel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | $ 116.0 |  |  |  |  |
Number of locations of the acquiree entity | location |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |
NIS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 18.7 |  |  |  |  |
AMS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 268.7 |  |  |  |  |
Number of locations of the acquiree entity | location |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |
Number of countries of the acquiree entity | country |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
AMS | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of countries in which entity's customers operate | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |
Fox Metals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  | 8.2 |  |  |  |  |
2016 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of the total purchase price of the acquisitions to the fair value of the assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | 1.5 |  |  |  |  |  |  |  | 1.5 | 1.5 | 1.5 |  |  |  |  |
Accounts receivable | 14.1 |  |  |  |  |  |  |  | 14.1 | 14.1 | 14.1 |  |  |  |  |
Inventories | 66.6 |  |  |  |  |  |  |  | 66.6 | 66.6 | 66.6 |  |  |  |  |
Property, plant and equipment | 62.2 |  |  |  |  |  |  |  | 62.2 | 62.2 | 62.2 |  |  |  |  |
Goodwill | 103.4 |  |  |  |  |  |  |  | 103.4 | 103.4 | 103.4 |  |  |  |  |
Intangible assets subject to amortization | 77.1 |  |  |  |  |  |  |  | 77.1 | 77.1 | 77.1 |  |  |  |  |
Intangible assets not subject to amortization | 38.2 |  |  |  |  |  |  |  | 38.2 | 38.2 | 38.2 |  |  |  |  |
Other current and long-term assets | 0.5 |  |  |  |  |  |  |  | 0.5 | 0.5 | 0.5 |  |  |  |  |
Total assets acquired | 363.6 |  |  |  |  |  |  |  | 363.6 | 363.6 | 363.6 |  |  |  |  |
Current and long-term debt | 6.1 |  |  |  |  |  |  |  | 6.1 | 6.1 | 6.1 |  |  |  |  |
Other current and long-term liabilities | 7.3 |  |  |  |  |  |  |  | 7.3 | 7.3 | 7.3 |  |  |  |  |
Total liabilities assumed | 13.4 |  |  |  |  |  |  |  | 13.4 | 13.4 | 13.4 |  |  |  |  |
Net assets acquired | 350.2 |  |  |  |  |  |  |  | 350.2 | 350.2 | 350.2 |  |  |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets not subject to amortization | 38.2 |  |  |  |  |  |  |  | 38.2 | 38.2 | 38.2 |  |  |  |  |
Tax deductible goodwill amount | $ 103.4 |  |  |  |  |  |  |  | $ 103.4 | $ 103.4 | $ 103.4 |  |  |  |  |
2014 acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of the total purchase price of the acquisitions to the fair value of the assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.6 |  |  |
Accounts receivable |  |  |  |  |  |  |  |  |  |  |  |  | 67.1 |  |  |
Inventories |  |  |  |  |  |  |  |  |  |  |  |  | 89.2 |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  | 23.4 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 51.3 |  |  |
Intangible assets subject to amortization |  |  |  |  |  |  |  |  |  |  |  |  | 37.5 |  |  |
Intangible assets not subject to amortization |  |  |  |  |  |  |  |  |  |  |  |  | 39.0 |  |  |
Other current and long-term assets |  |  |  |  |  |  |  |  |  |  |  |  | 1.5 |  |  |
Total assets acquired |  |  |  |  |  |  |  |  |  |  |  |  | 310.6 |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | 39.2 |  |  |
Deferred taxes |  |  |  |  |  |  |  |  |  |  |  |  | 9.0 |  |  |
Other current and long-term liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 53.1 |  |  |
Total liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  | 101.3 |  |  |
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  | 209.3 |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets not subject to amortization |  |  |  |  |  |  |  |  |  |  |  |  | 39.0 |  |  |
Tax deductible goodwill amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.3 |  |  |

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