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Financial Instruments (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Cash    
Derivative Financial Instruments    
Deferred compensation, Rabbi Trust $ 5.9 $ 10.7
Short-term Investments    
Derivative Financial Instruments    
Deferred compensation, Rabbi Trust 5.3 4.3
Foreign Exchange Forward | Designated as Hedging Instrument    
Derivative Financial Instruments    
Fair value (1.3) 0.2
Notional amount 119.3 95.0
Foreign Exchange Forward | Not Designated as Hedging Instrument    
Derivative Financial Instruments    
Fair value (0.4) 0.1
Notional amount $ 48.0 $ 49.9
Maximum | Foreign Exchange Forward | Not Designated as Hedging Instrument    
Derivative Financial Instruments    
Maturity term 1 year  
Maximum | Cash Flow Hedging | Foreign Exchange Forward | Designated as Hedging Instrument    
Derivative Financial Instruments    
Maturity term 1 year