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Borrowings and Lines of Credit - Schedule of Interest Expense and Interest Income (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 09, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Document Fiscal Year Focus   2018    
Interest expense(1)   $ 16.6 $ 20.8 $ 20.5
Interest income   (0.6) (0.2) (0.1)
Interest Revenue (Expense), Net   (16.0) (20.6) (20.4)
Write off of Deferred Debt Issuance Cost $ 0.7 0.4    
Maturities of Long-term Debt [Abstract]        
Long-term Debt, Maturities, Repayments of Principal in Year Two   0.0    
Long-term Debt, Maturities, Repayments of Principal in Year Three   172.5    
Convertible Debt | Convertible Notes Due Twenty Twenty One [Member]        
Debt Instrument [Line Items]        
Interest Expense, Debt, Excluding Amortization   5.6 5.6 3.7
Interest Expense, Debt   12.8 $ 12.3 $ 7.9
Maturities of Long-term Debt [Abstract]        
Long-term Debt, Maturities, Repayments of Principal in Year Four   $ 9.0