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Acquisitions (Details) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended | 21 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May. 16, 2014 USD ($) | Apr. 30, 2013 USD ($) item | Apr. 12, 2013 USD ($) item | Dec. 31, 2015 USD ($) item | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) item | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2014 USD ($) | Aug. 01, 2014 country item | Apr. 04, 2013 USD ($) | Dec. 31, 2012 USD ($)
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  | $ 2,026.2 | $ 2,286.2 | $ 2,423.7 | $ 2,614.4 | $ 2,576.7 | $ 2,705.1 | $ 2,616.8 | $ 2,553.0 | $ 9,350.5 | $ 10,451.6 | $ 9,223.8 |  |  |  |
Proceeds from sale of business, net |  |  |  |  |  |  |  |  |  |  |  |  | 26.2 | 11.9 |  |  |  |
Number of countries of the acquiree entity | item |  |  |  | 12 |  |  |  |  |  |  |  | 12 |  |  |  |  |  |
Allocation of the total purchase price of the acquisitions to the fair value of the assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 1,724.8 |  |  |  | 1,736.4 |  |  |  | $ 1,724.8 | 1,736.4 | 1,691.6 | $ 1,736.4 |  |  | $ 1,314.6
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax deductible goodwill amount |  |  |  | $ 558.7 |  |  |  |  |  |  |  | 558.7 |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 39.0 |  |  |  |  | 39.0 | 206.8 | 39.0 |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets not subject to amortization |  |  |  |  |  |  |  | 39.0 |  |  |  |  | 39.0 | 206.8 | 39.0 |  |  |
Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired subject to amortization |  |  |  |  |  |  |  |  |  |  |  |  | $ 37.3 | $ 135.3 |  |  |  |
Weighted average lives of identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 13 years 7 months 6 days | 12 years 6 months |  |  |  |
Unsecured revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity of the revolving credit facility |  |  | $ 1,500.0 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500.0 |
Term loan expiring April 4, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt, proceeds from which is used to fund transaction |  |  | 500.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes due April 15, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt, proceeds from which is used to fund transaction |  |  | 500.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NIS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 19.9 |  |  |  |  |  |
AMS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 257.6 |  |  |  |  |  |
Number of countries of the acquiree entity | country |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
AMS | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of countries in which entity's customers operate | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |
Travel Main |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties of acquired entity which were leased by subsidiaries of reporting entity | item |  | 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total transaction value |  | $ 78.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of debt assumed |  | $ 43.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Metals USA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 1,540.0 |  |  |  |  |  |
Total transaction value |  |  | 1,250.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of debt assumed |  |  | $ 486.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of service centers acquired | item |  |  | 41 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 766.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired debt not refinanced through proceeds from debt |  |  | 12.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.4 |  |  |  |
Allocation of the total purchase price of the acquisitions to the fair value of the assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  | 3.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  | 206.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories |  |  | 379.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | 242.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 382.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets subject to amortization |  |  | 137.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets not subject to amortization |  |  | 203.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current and long-term assets |  |  | 9.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired |  |  | 1,563.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred taxes |  |  | 184.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  | 486.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other current and long-term liabilities |  |  | 126.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities assumed |  |  | 796.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired |  |  | 766.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets not subject to amortization |  |  | $ 203.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Metals USA | Non-core roofing business | Disposal Group, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.6 |  | 25.4 |  |  |
Proceeds from sale of business, net | $ 26.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax loss on sale of business | 1.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fox |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | 21.6 |  |  |  |  |  |
Haskins Steel Co., Inc. (Haskins Steel) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  | $ 26.0 |  |  |  |  |  |
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 |  |  |  |  | 1.6 |  | 1.6 |  |  |
Accounts receivable |  |  |  |  |  |  |  | 67.1 |  |  |  |  | 67.1 |  | 67.1 |  |  |
Inventories |  |  |  |  |  |  |  | 89.2 |  |  |  |  | 89.2 |  | 89.2 |  |  |
Property, plant and equipment |  |  |  |  |  |  |  | 23.4 |  |  |  |  | 23.4 |  | 23.4 |  |  |
Goodwill |  |  |  |  |  |  |  | 51.3 |  |  |  |  | 51.3 |  | 51.3 |  |  |
Intangible assets subject to amortization |  |  |  |  |  |  |  | 37.5 |  |  |  |  | 37.5 |  | 37.5 |  |  |
Intangible assets not subject to amortization |  |  |  |  |  |  |  | 39.0 |  |  |  |  | 39.0 |  | 39.0 |  |  |
Other current and long-term assets |  |  |  |  |  |  |  | 1.5 |  |  |  |  | 1.5 |  | 1.5 |  |  |
Total assets acquired |  |  |  |  |  |  |  | 310.6 |  |  |  |  | 310.6 |  | 310.6 |  |  |
Deferred taxes |  |  |  |  |  |  |  | 9.0 |  |  |  |  | 9.0 |  | 9.0 |  |  |
Current and long-term debt |  |  |  |  |  |  |  | 39.2 |  |  |  |  | 39.2 |  | 39.2 |  |  |
Other current and long-term liabilities |  |  |  |  |  |  |  | 53.1 |  |  |  |  | 53.1 |  | 53.1 |  |  |
Total liabilities assumed |  |  |  |  |  |  |  | 101.3 |  |  |  |  | 101.3 |  | 101.3 |  |  |
Net assets acquired |  |  |  |  |  |  |  | 209.3 |  |  |  |  | 209.3 |  | 209.3 |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets not subject to amortization |  |  |  |  |  |  |  | 39.0 |  |  |  |  | 39.0 |  | 39.0 |  |  |
Tax deductible goodwill amount |  |  |  |  |  |  |  | $ 20.3 |  |  |  |  | $ 20.3 |  | $ 20.3 |  |  |
2013 acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax deductible goodwill amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 107.7 |  |  |  |
Businesses Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary purchase price allocation information for all acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax deductible goodwill amount | $ 17.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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