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Accumulated Other Comprehensive Loss	3 Months Ended
Accumulated Other Comprehensive Loss	Mar. 31, 2018
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The accumulated balance of other comprehensive income (loss), net of tax, for the three months ended March 31, 2018 increased $24.8 million due to cumulative translation adjustments for its non-US dollar functional currency subsidiaries.