Debt and Credit Arrangements - Notes Interest Accretion Schedule (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Debt Instrument
Interest accretion of convertible notes discount			$ 5.7	$ 7.3
Convertible Debt \| Convertible Notes, due 2024
Debt Instrument
Interest accretion of convertible notes discount	$ 2.0	$ 1.9	5.7	5.4
Debt instrument, interest expense	0.6	0.6	1.9	1.9
Interest expense	2.6	2.5	7.6	7.3
Financing costs amortization	$ 0.2	0.2	$ 0.5	0.5
Convertible Debt \| Convertible Notes, Due 2018
Debt Instrument
Interest accretion of convertible notes discount		0.4		1.9
Debt instrument, interest expense		0.1		1.0
Interest expense		$ 0.5		$ 2.9

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 amortization expense attributable to debt issuance costs.

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

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