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Sale of Stock, Consideration Received on Transaction, Cash to Balance Sheet

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

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The cash outflow for reacquisition of callable preferred stock.

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Cash paid for expenses incurred during underwriting activities (the process to review insurance applications, evaluate risks, accept or reject applications, and determine the premiums to be charged) for insurance companies.

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash inflow from the additional capital contribution to the entity.

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Initial Public Offering (IPO) - Use of Proceeds from IPO (Details) - USD ($) $ in Millions			1 Months Ended	6 Months Ended
	Jul. 06, 2020	Aug. 08, 2018	Feb. 07, 2019	Jun. 30, 2020	Jun. 30, 2019
Class of Stock [Line Items]
Gross proceeds			$ 0.0	$ 0.0	$ 3,101.4
IPO related expenses		$ 21.6
Partial redemption of 10.250% senior unsecured notes and accrued interest			0.0	0.0	625.1
Call premium on partial redemption of 10.250% senior unsecured notes			$ 0.0	$ 0.8	$ 0.0
Subsequent Event
Class of Stock [Line Items]
Gross proceeds	$ 2,381.0
Underwriter fees	89.1
IPO related expenses	42.3
Redemption of Series A Preferred Stock	1,067.9
Make-whole payment on redemption of Series A Preferred Stock	205.2
Partial redemption of 10.250% senior unsecured notes and accrued interest	312.0
Call premium on partial redemption of 10.250% senior unsecured notes	30.8
Cash to balance sheet	633.7
Subsequent Event \| Star Parent, L.P. \| Affiliated Entity
Class of Stock [Line Items]
IPO related expenses	30.0
Subsequent Event \| THL Managers \| Affiliated Entity
Class of Stock [Line Items]
IPO related expenses	2.5
Subsequent Event \| Bilcar \| Board of Directors Chairman
Class of Stock [Line Items]
IPO related expenses	2.5
Subsequent Event \| CC Star Holdings, LP \| Director
Class of Stock [Line Items]
IPO related expenses	$ 2.5