Debt and Credit Arrangements - Notes Interest Accretion Schedule (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument
Interest accretion of convertible notes discount	$ 7.6	$ 9.1	$ 12.8
Interest expense, debt	17.7	15.9	9.3
Total loss on extinguishment of debt	0.0	0.0	4.9
Financing costs amortization	3.0	1.3	1.3
Convertible Debt \| Convertible Notes, due 2024
Debt Instrument
Interest accretion of convertible notes discount	7.6	7.2
Debt instrument, interest expense	2.6	2.6
Interest expense, debt	10.2	9.8
Financing costs amortization	$ 0.7	0.6
Convertible Debt \| Convertible Notes, due 2018
Debt Instrument
Interest accretion of convertible notes discount		1.9	11.8
Debt instrument, interest expense		1.0	4.3
Interest expense, debt		2.9	16.1
Loss on extinguishment of debt, bond cost portion		0.0	4.3
Write off of unamortized debt issuance costs		0.0	0.4
Total loss on extinguishment of debt		0.0	4.7
Financing costs amortization		$ 0.1	$ 0.6

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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