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Revenue from Contracts with Customers - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) segment | Sep. 30, 2017 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Inventories, net | $ 1,239,800,000 |  | $ 1,239,800,000 |  |  | $ 1,176,100,000
Adjustment from current cost to LIFO cost basis | (1,700,000) |  | (1,700,000) |  |  | (43,100,000)
Sales | 1,020,200,000 | $ 869,100,000 | 3,008,700,000 | $ 2,615,200,000 |  |
Cost of sales | 859,800,000 | 763,800,000 | 2,526,000,000 | 2,260,800,000 |  |
Short-term contract assets | 51,600,000 |  | 51,600,000 |  | $ 36,500,000 | 0
Long-term contract assets | 100,000 |  | 100,000 |  | 16,900,000 |
Accrued liabilities | 228,700,000 |  | 228,700,000 |  |  | 282,400,000
Other long-term liabilities | 66,700,000 |  | 66,700,000 |  |  | 73,200,000
Short-term contract liabilities | 69,200,000 |  | 69,200,000 |  | 69,700,000 | 0
Long-term contract liabilities | 7,300,000 |  | $ 7,300,000 |  | 22,200,000 | 0
Number of business segments | segment |  |  | 2 |  |  |
Revenue, Performance Obligation [Abstract] |  |  |  |  |  |
Confirmed order backlog | 2,170,000,000 | $ 1,810,000,000 | $ 2,170,000,000 | $ 1,810,000,000 |  |
Confirmed orders with current performance obligations | 0.82 |  | 0.82 |  |  |
Accounts receivable with customers | 594,500,000 |  | 594,500,000 |  |  | $ 550,900,000
Contract costs for obtaining and fulfilling contracts | 5,200,000 |  | 5,200,000 |  |  |
Amortization of contract costs | 300,000 |  | 900,000 |  |  |
ASU 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Inventories, net | 14,200,000 |  | 14,200,000 |  | 28,800,000 |
Adjustment from current cost to LIFO cost basis |  |  |  |  | 11,800,000 |
Short-term contract assets | 4,600,000 |  | 4,600,000 |  | 3,700,000 |
Increase in accounts receivable | 3,700,000 |  | 3,700,000 |  | 3,900,000 |
Accrued liabilities | (46,700,000) |  | (46,700,000) |  | (44,800,000) |
Other long-term liabilities | (7,300,000) |  | (7,300,000) |  | (10,700,000) |
Short-term contract liabilities | 69,200,000 |  | 69,200,000 |  | 69,700,000 |
Long-term contract liabilities | 7,300,000 |  | 7,300,000 |  | 22,200,000 |
ASU 2014-09 | Revenue Recognized Over-time |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Increase in retained earnings |  |  |  |  | 15,500,000 |
Contract assets | 47,100,000 |  | 47,100,000 |  | 49,700,000 |
Inventories, net | 4,100,000 |  | 4,100,000 |  | $ (34,200,000) |
Sales | 1,800,000 |  | (2,500,000) |  |  |
Cost of sales | 1,100,000 |  | (4,100,000) |  |  |
Short-term contract assets | 47,000,000 |  | 47,000,000 |  |  |
Long-term contract assets | $ 100,000 |  | $ 100,000 |  |  |

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- Definition For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(9)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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