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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (10.5)	$ 30.2	$ (37.4)	$ 6.0
Other comprehensive income (loss), net of income taxes:
Foreign currency translation gain (loss)	(0.1)	3.6	(0.1)	1.3
Unrealized income on marketable debt securities	0.5	0.0	0.6	0.0
Total other comprehensive income, net	0.4	3.6	0.5	1.3
Comprehensive income (loss)	$ (10.1)	$ 33.8	$ (36.9)	$ 7.3

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- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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