Revenue (Tables)

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table disaggregates our revenue by product and service offering and timing of transfer of control:

	Year Ended December 31, 2020
	Americas		Asia Pacific		Europe, Middle East, & Africa		Total
Sales by Product and Service Offering:
Critical infrastructure & solutions	$	1,074.2	$	853.8	$	529.7	$	2,457.7
Services & spares	662.6		371.1		291.1		1,324.8
Integrated rack solutions	303.8		143.5		140.8		588.1
Total	$	2,040.6	$	1,368.4	$	961.6	$	4,370.6
Timing of revenue recognition:
Products and services transferred at a point in time	$	1,418.9	$	1,078.5	$	751.9	$	3,249.3
Products and services transferred over time	621.7		289.9		209.7		1,121.3
Total	$	2,040.6	$	1,368.4	$	961.6	$	4,370.6

	Year Ended December 31, 2019
	Americas		Asia Pacific		Europe, Middle East, & Africa		Total
Sales by Product and Service Offering: (1)
Critical infrastructure & solutions	$	1,225.6	$	755.5	$	486.4	$	2,467.5
Services & spares	689.8		361.1		287.2		1,338.1
Integrated rack solutions	313.7		161.4		150.5		625.6
Total	$	2,229.1	$	1,278.0	$	924.1	$	4,431.2
Timing of revenue recognition:
Products and services transferred at a point in time	$	1,592.4	$	1,007.1	$	748.9	$	3,348.4
Products and services transferred over time	636.7		270.9		175.2		1,082.8
Total	$	2,229.1	$	1,278.0	$	924.1	$	4,431.2

(1)Comparative results for Critical infrastructure & solutions, Services & spares and Integrated rack solutions for the year ended December 31, 2019 have been adjusted by $(165.1), $39.2, and $125.9, respectively, to reflect the strategic realignment described above.

	Year Ended December 31, 2018
	Americas		Asia Pacific		Europe, Middle East, & Africa		Total
Sales by Product and Service Offering: (2)
Critical infrastructure & solutions	$	1,118.8	$	729.1	$	453.2	$	2,301.1
Services & spares	689.9		344.2		271.2		1,305.3
Integrated rack solutions	337.0		170.9		171.3		679.2
Total	$	2,145.7	$	1,244.2	$	895.7	$	4,285.6
Timing of revenue recognition:
Products and services transferred at a point in time	$	1,530.6	$	973.5	$	701.8	$	3,205.9
Products and services transferred over time	615.1		270.7		193.9		1,079.7
Total	$	2,145.7	$	1,244.2	$	895.7	$	4,285.6

(2)Comparative results for Critical infrastructure & solutions, Services & spares and Integrated rack solutions for the year ended December 31, 2018 have been adjusted by $(150.7), $29.2, and $121.5, respectively, to reflect the strategic realignment described above.

Schedule of Contract Assets, Liabilities and Deferred Revenue

The opening and closing balances of our current and long-term contract liabilities and current and long-term deferred revenue are as follows:

	Balances at December 31, 2020		Balances at December 31, 2019
Deferred revenue - current (1)	$	199.6	$	160.9
Deferred revenue - noncurrent (2)	38.8		41.3
Other contract liabilities - current (1)	36.1		39.8

(1) Current deferred revenue and contract liabilities are included within accrued expenses.

(2) Noncurrent deferred revenue is recorded within other long-term liabilities.