Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Other Taxes (Details)

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Income Taxes - Schedule of Other Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Payroll taxes $ 17.3 $ 18.9 $ 19.2
Property and franchise taxes $ 4.7 $ 4.8 $ 4.9