Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Reconciliation of CVR Liability (Detail)

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Fair Value Measurements - Schedule of Reconciliation of CVR Liability (Detail) - Level 3 Inputs [Member] - Contingent Value Right [Member]
$ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Fair value as of December 31, 2018 $ 15.7
Net unrealized gain (14.4) [1]
Fair value as of June 30, 2019 $ 1.3
[1] Unrealized gains and losses related to the revaluation of the CVR are recorded in other (income) expense, net within the Company’s condensed consolidated statements of income.