Balance Sheet Information - Lease expense (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Balance Sheet Related Disclosures [Abstract]
Operating lease	$ 35.0
Variable lease	4.0
Short-term lease	2.6
Total lease expense	41.6
Accrued expenses and other current liabilities	26.1
Other long-term liabilities	87.9
Lease liabilities	$ 114.0