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Debt - Summary of Components of Long-Term Borrowings and Finance Lease Obligations (Details) - USD ($) $ in Millions		Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Finance lease obligations		$ 0.6	$ 0.7
Total long-term borrowings and finance lease obligations, including current portion		249.3	210.1
Less: Current finance lease obligations		0.2	0.2
Total long-term borrowings and finance lease obligations		249.1	209.9
Amended 2016 Credit Agreement
Debt Instrument [Line Items]
Long-term borrowings	[1]	0.0	209.4
2019 Credit Agreement
Debt Instrument [Line Items]
Long-term borrowings		$ 248.7	$ 0.0
[1] Defined as the Amended and Restated Credit Agreement, dated January 27, 2016, as amended on June 2, 2017.

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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