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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |
Net cash used in operating activities |  |  |  | $ (390.5) | $ (206.8)
Net cash provided by (used in) financing activities |  |  |  | (262.9) | (797.7)
ASU 2017-07 [Member] |  |  |  |  |
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |
Income reclassified from selling, general and administrative expenses ("SG&A") to other expense (income), net |  |  | $ 2.4 |  | 5.0
Accounting Standards Update 2016-15 [Member] |  |  |  |  |
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |
Net cash used in operating activities |  |  |  |  | 34.2
Net cash provided by (used in) financing activities |  |  |  |  | (34.2)
Accounting Standards Update 2016-16 [Member] | Retained Earnings And Prepaid Expenses And Other [Member] |  |  |  |  |
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |
Retained earnings and prepaid expenses | $ (9.5) |  |  |  |
Sprue Aegis [Member] |  |  |  |  |
Basis of Presentation and Significant Accounting Policies [Line Items] |  |  |  |  |
Revenue from related parties |  | $ 0.0 | $ 8.7 | $ 7.5 | $ 15.4
Investment owned, percentage |  | 23.40% |  | 23.40% |

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