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Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Assets and Liabilities Measured at fair value on a recurring basis    
Cash and cash equivalents $ 46.8 $ 26.6
Restricted cash 0.5 0.6
Short-term investments 0.1  
Fair Value, Recurring [Member]    
Assets and Liabilities Measured at fair value on a recurring basis    
Cash and cash equivalents 134.6 105.9
Restricted cash 0.5 0.6
Short-term investments 20.8 21.8
Foreign currency hedges 11.7 4.6
Total Assets 214.5 159.5
Foreign currency hedges 0.3 0.7
Total Liabilities 0.3 0.7
Fair Value, Recurring [Member] | Level 1 [Member]    
Assets and Liabilities Measured at fair value on a recurring basis    
Cash and cash equivalents 133.2 104.4
Restricted cash 0.5 0.6
Short-term investments 0.0 0.0
Foreign currency hedges 0.0 0.0
Total Assets 133.7 105.0
Foreign currency hedges 0.0 0.0
Total Liabilities 0.0 0.0
Fair Value, Recurring [Member] | Level 2 [Member]    
Assets and Liabilities Measured at fair value on a recurring basis    
Cash and cash equivalents 1.4 1.5
Restricted cash 0.0 0.0
Short-term investments 20.8 21.8
Foreign currency hedges 11.7 4.6
Total Assets 33.9 27.9
Foreign currency hedges 0.3 0.7
Total Liabilities 0.3 0.7
Fair Value, Recurring [Member] | Level 3 [Member]    
Assets and Liabilities Measured at fair value on a recurring basis    
Cash and cash equivalents 0.0 0.0
Restricted cash 0.0 0.0
Short-term investments 0.0 0.0
Foreign currency hedges 0.0 0.0
Total Assets 0.0 0.0
Foreign currency hedges 0.0 0.0
Total Liabilities $ 0.0 $ 0.0