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Accumulated Other Comprehensive Loss	6 Months Ended
Accumulated Other Comprehensive Loss	Jun. 30, 2018
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The accumulated balance of other comprehensive loss, net of tax, for the three and six months ended June 30, 2018 decreased $16.7 million and increased $8.1 million, respectively, due to cumulative translation adjustments for its non-US dollar functional currency subsidiaries.