Leases (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2020

Dec. 31, 2019

Leases [Abstract]

Summary of Operating Lease Expense, Cash Flow Information, And Weighted Average Remaining Lease Terms and Discount Rates

Operating lease expense is as follows:

	Nine months ended September 30, 2020			Nine months ended September 30, 2019
Operating lease cost		$	38.3		$	37.5
Short-term and variable lease cost			19.5			21.8
Total lease cost		$	57.8		$	59.3

Supplemental cash flow information related to operating leases is as follows:

	Nine months ended September 30, 2020			Nine months ended September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows – Payments on operating leases		$	38.3		$	37.5
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases		$	42.0		$	142.8

	Year ended
	December 31, 2019
Operating lease cost	$	49.7
Short-term and variable lease cost		31.6
Total lease cost	$	81.3

Supplemental Balance Sheet Information Related to Operating Leases

Supplemental balance sheet information related to operating leases is as follows:

	Financial statement line item	September 30, 2020			December 31, 2019
Operating lease right-of-use assets	Other assets		$	127.4		$	110.4
Operating lease liabilities	Accrued expenses and other liabilities			38.2			35.0
Operating lease liabilities	Other long-term liabilities			93.1			78.2
Total lease liabilities			$	131.3		$	113.2

Weighted average remaining lease terms and discount rates for operating leases are as follows:

	September 30, 2020	December 31, 2019
Weighted Average Remaining Lease Term	4.3 years	4.5 years
Weighted Average Discount Rate	6.4%	7.3%

Summary of Maturities of Lease Liabilities

Maturities of lease liabilities are as follows:

​	As of September 30, 2020			As of December 31, 2019
​	Operating Leases
2020	​	$	12.9	​	$	43.3
2021	​	​	43.4	​	​	31.6
2022	​	​	35.1	​	​	24.1
2023	​	​	27.6	​	​	18.0
2024	​	​	16.9	​	​	10.6
Thereafter	​	​	18.6	​	​	14.2
Total Lease Payments	​	​	154.5	​	​	141.8
Less: Imputed Interest	​	​	(23.2)	​	​	(28.6)
Present value of lease liabilities	​	$	131.3	​	$	113.2

	December 31, 2019
	Operating Leases
2020	$	43.3
2021		31.6
2022		24.1
2023		18.0
2024		10.6
Thereafter		14.2
Total Lease Payments		141.8
Less: Imputed Interest		(28.6)
Present value of lease liabilities	$	113.2

2019	$	51.4
2020		37.2
2021		25.4
2022		17.9
2023		12.4
Thereafter		19.2
Total noncancelable long-term leases	$	163.5