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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Right of use assets |  | $ 646.0 |  |  | $ 646.0 |  | $ 0.0
Lease liabilities |  | 701.0 |  |  | 701.0 |  |
Proceeds from Sale and Collection of Receivables |  | $ 201.0 |  |  |  |  |
Disposal group subject to inaccurate impairment assessment |  |  | 1 |  |  |  |
Disposal groups held for sale |  |  | 5 |  |  |  |
Restatement Adjustment |  |  |  |  |  |  |
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Impairment Charge on Reclassified Assets |  |  |  |  | $ 12.6 |  |
Restatement of Prior Year Income, Tax Effects |  |  |  |  |  |  | $ 12.0
Accounting Standards Update 2016-02 |  |  |  |  |  |  |
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Retained earnings and prepaid expenses | $ 0.5 |  |  |  |  |  |
Fire Angel Safety Technology Group PLC |  |  |  |  |  |  |
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Investment owned, percentage |  | 23.40% |  |  | 23.40% |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  | $ 11.7 |  |
Equity Method Investments |  | $ 4.6 |  |  | $ 4.6 |  |
Revenue from related parties |  |  |  | $ 0.0 |  | $ 7.5 |
Operating Lease Assets |  |  |  |  |  |  |
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Right of use assets | 629.0 |  |  |  |  |  |
Lease liabilities | $ 687.0 |  |  |  |  |  |

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