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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |
Right of use assets | $ 619.3 |  |
Lease liabilities | 685.4 |  |
Restatement Adjustment [Member] |  |  |
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |
Restatement of Prior Year Income, Tax Effects |  |  | $ 12.0
Impairment Charge on Reclassified Assets | 12.6 |  |
Accounting Standards Update 2016-02 [Member] |  |  |
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |
Retained earnings and prepaid expenses | $ 0.5 |  |
Fire Angel Safety Technology Group PLC [Member] |  |  |
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |
Revenue from related parties |  | $ 7.5 |
Investment owned, percentage | 23.40% |  |
Equity Method Investment, Other than Temporary Impairment | $ 11.7 |  |
Equity Method Investments | 2.9 |  |
Operating Lease Assets [Member] |  |  |
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |
Right of use assets | 629.0 |  |
Lease liabilities | $ 687.0 |  |

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=114001220&loc=d3e32787-111569 + Details
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