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Organization - Use of the Proceeds from the IP (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Gross proceeds | $ 631.3
Underwriters' discounts and commissions | 29.2
IPO-related expenses | 11.8
Redemption of 11% Senior Notes due 2021 (Note 8) | 1,132.3
Sponsor management termination fee | 11.3
Debt refinancing expenses | 11.4
Cash to balance sheet | 68.6
Senior Notes [Member] | 11% Senior Note [Member] |
Consolidation, Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Redemption of 11% Senior Notes due 2021 (Note 8) | 475.0
Call premium on redemption of 11% Senior Notes due 2021 | 13.1
Interest on redemption of 11% Senior Notes due 2021 | $ 10.9

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