Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note, debt instrument	$ 168.2	$ 128.3
Money Market Funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	28.4	$ 37.7
Fixed Time Deposits | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 3.0