Borrowings and Lines of Credit - Schedule of Interest Expense and Interest Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Document Fiscal Year Focus	2019
Interest expense(1)	$ 15.3	$ 16.6	$ 20.8
Interest income	(0.8)	(0.6)	(0.2)
Interest Revenue (Expense), Net	(14.5)	(16.0)	(20.6)
Write off of Deferred Debt Issuance Cost			0.4
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Year Two	172.5
Long-term Debt, Maturities, Repayments of Principal in Year Three	0.0
Convertible Debt | Convertible Notes Due Twenty Twenty One [Member]
Debt Instrument [Line Items]
Interest Expense, Debt, Excluding Amortization	5.6	5.6	5.6
Interest Expense, Debt	13.3	$ 12.8	$ 12.3
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Year Four	$ 0.0