Summary of Lease information (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Noncash component of lease expense				$ 14.4	$ 13.2
Lease extension term	5 years	10 years	10 years
Lease expiration period	2029		2033
Increase (decrease) in right-of-use asset	$ 7.3	$ 53.0
Increase (decrease) in operating lease liabilities	$ 7.3	$ 53.0