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Business Combinations Hudson Net Assets Acquired (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Sep. 20, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 468.8 |  |  |  | $ 218.0 | $ 218.4
Restricted Cash and Cash Equivalents | 8.8 |  |  |  |  |
Hudson [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 238.3 |  | $ 227.4 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill | 10.9 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 211.0 |  | 202.0 | $ 211.0 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles | 9.0 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 34.6 |  | 34.6 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 29.4 |  | 30.6 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment | 1.2 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | 26.5 |  | 24.9 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory | 1.6 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other | 8.1 | [1] | 9.3 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other current assets | 1.2 |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Unbilled Contract Revenue | 4.9 |  | 4.6 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Unbilled contract revenue | 0.3 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 2.9 |  | 2.9 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets | 0.9 |  | 0.9 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent | 87.6 |  | 68.6 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred tax liabilities | 19.0 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | 21.2 |  | 21.2 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Customer Advances and Billings In Excess of Contract Revenue | 17.4 |  | 16.9 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Customer advances and billings in excess of contract revenue | 0.5 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Accrued Salaries Wages and Benefits | 4.4 |  | 4.4 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other | 3.8 |  | 4.0 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other current liabilities | 0.2 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | 1.9 |  | 1.9 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Current portion of warranty reserve | 0.8 |  | 0.8 |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 419.5 |  | $ 419.4 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 0.1 |  |  |  |  |
Restricted Cash and Cash Equivalents |  |  |  | $ 2.3 |  |
[1] | (1) Pursuant to the provisions of the Merger Agreement, Hudson deposited $2.3 into a Rabbi Trust which represents amounts payable to eligible parties under Long-Term Incentive Agreements. This balance is treated as restricted cash and restricted cash equivalents in the consolidated balance sheets and is classified as other current assets.

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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=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent. + 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=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, 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=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of inventory recognized as of 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=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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