Balance Sheet Information - Lease expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]
Operating lease	$ 38.2	$ 35.0
Variable lease	4.2	4.0
Short-term lease	4.1	2.6
Total lease expense	46.5	41.6
Accrued expenses and other current liabilities	32.2	26.1
Other long-term liabilities	115.7	87.9
Lease liabilities	$ 147.9	$ 114.0
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent	us-gaap:AccruedLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent	us-gaap:OtherLiabilitiesNoncurrent