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Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense for the three months ended March 31, 2017 was $114.8 million, representing an effective tax rate of 29.4%. The prior-year three-month provision for income taxes was $113.8 million, representing an effective tax rate of 31.7%.