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Indebtedness - New Senior Notes - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
9.25% Senior Notes Due 2026
Debt Instrument [Line Items]
Aggregate principal amount	$ 550.0
Interest rate on notes	9.25%	9.25%
Debt instrument maturity year	2026
Net proceeds after underwriting expenses	$ 541.6
Net proceeds after commissions	$ 8.4
Maximum redemption price of notes as percentage of principal amount		100.00%
5.75% Senior Notes Due 2021
Debt Instrument [Line Items]
Interest rate on notes	5.75%	5.75%	5.75%
Repayments of senior notes	$ 324.1
5.875% Senior Notes Due 2022
Debt Instrument [Line Items]
Interest rate on notes	5.875%	5.875%	5.875%
Repayments of senior notes	$ 175.9

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