Accrued Expenses Accrued Expenses Footnote (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Accrued expenses		$ 112.1
Total Current Liabilities
Concentration Risk [Line Items]
Benchmark for individual components of accrued expenses, percentage	5.00%