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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Foreign currency exchange gains (losses)	$ 0.2	$ (0.7)
Unrealized loss on derivatives arising during period, before tax	1.0	1.2
Other comprehensive income (loss), tax	$ 0.1	$ 0.1

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Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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