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Debt - Debt Issuance Costs (Details) - USD ($) $ in Millions		12 Months Ended
	Sep. 25, 2018	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Write off of deferred debt issuance costs	$ 0.5
Deferred debt issuance costs		$ 7.2	$ 5.8
Expected Future Amortization Expense [Abstract]
2019		1.3
2020		1.3
2021		1.3
2022		1.3
2023		1.0
Thereafter		1.0
Total		7.2	5.8
Interest expense
Debt Instrument [Line Items]
Amortization expense		$ 1.7	$ 1.8
New Credit Facility and Bond Indenture
Debt Instrument [Line Items]
Capitalized deferred debt issuance costs	$ 3.6

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Amount of amortization expense attributable to debt issuance costs.

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The amount of debt issuance costs that were incurred during a noncash or partial noncash transaction.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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