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Debt and Credit Arrangements - Notes Interest Accretion Schedule (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument
Interest accretion of convertible notes discount	$ 1.9	$ 1.8
Interest expense exlculding amortization	7.2	5.3
Financing costs amortization	1.0	0.4
Convertible Debt | Convertible Notes, due 2024
Debt Instrument
Interest accretion of convertible notes discount	1.9	1.8
Interest expense exlculding amortization	0.6	0.6
Total interest expense	2.5	2.4
Financing costs amortization	$ 0.2	$ 0.2

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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