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Segment and Geographic Area Information - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net revenues	$ 1,505.3	$ 1,366.1	$ 1,305.0	$ 1,350.7	$ 1,394.8	$ 1,354.5	$ 1,330.3	$ 1,287.2	$ 5,527.1	$ 5,366.8	$ 5,191.2
Canada
Segment Reporting Information [Line Items]
Net revenues									216.3	222.4	211.3
Canada | Application Software
Segment Reporting Information [Line Items]
Net revenues									43.4	41.0	38.5
Canada | Network Software & Systems
Segment Reporting Information [Line Items]
Net revenues									76.2	71.1	58.5
Canada | Measurement &Analytical Solutions
Segment Reporting Information [Line Items]
Net revenues									71.9	81.4	79.3
Canada | Process Technologies
Segment Reporting Information [Line Items]
Net revenues									24.8	28.9	35.0
Europe
Segment Reporting Information [Line Items]
Net revenues									625.6	646.5	680.0
Europe | Application Software
Segment Reporting Information [Line Items]
Net revenues									205.5	188.8	188.6
Europe | Network Software & Systems
Segment Reporting Information [Line Items]
Net revenues									61.3	36.7	12.2
Europe | Measurement &Analytical Solutions
Segment Reporting Information [Line Items]
Net revenues									257.0	307.2	361.7
Europe | Process Technologies
Segment Reporting Information [Line Items]
Net revenues									101.8	113.8	117.5
Asia
Segment Reporting Information [Line Items]
Net revenues									237.8	315.3	349.9
Asia | Application Software
Segment Reporting Information [Line Items]
Net revenues									3.3	3.5	3.2
Asia | Network Software & Systems
Segment Reporting Information [Line Items]
Net revenues									19.6	18.8	11.0
Asia | Measurement &Analytical Solutions
Segment Reporting Information [Line Items]
Net revenues									124.1	185.0	220.3
Asia | Process Technologies
Segment Reporting Information [Line Items]
Net revenues									90.8	108.0	115.4
Middle East
Segment Reporting Information [Line Items]
Net revenues									100.7	103.6	102.1
Middle East | Application Software
Segment Reporting Information [Line Items]
Net revenues									6.6	8.6	4.7
Middle East | Network Software & Systems
Segment Reporting Information [Line Items]
Net revenues									39.8	37.5	48.6
Middle East | Measurement &Analytical Solutions
Segment Reporting Information [Line Items]
Net revenues									18.5	13.1	14.4
Middle East | Process Technologies
Segment Reporting Information [Line Items]
Net revenues									35.8	44.4	34.4
Rest of the world
Segment Reporting Information [Line Items]
Net revenues									124.2	135.8	134.8
Rest of the world | Application Software
Segment Reporting Information [Line Items]
Net revenues									31.1	25.8	29.5
Rest of the world | Network Software & Systems
Segment Reporting Information [Line Items]
Net revenues									11.6	9.5	7.8
Rest of the world | Measurement &Analytical Solutions
Segment Reporting Information [Line Items]
Net revenues									43.1	45.3	42.5
Rest of the world | Process Technologies
Segment Reporting Information [Line Items]
Net revenues									38.4	55.2	55.0
Non-U.S.
Segment Reporting Information [Line Items]
Net revenues									1,304.6	1,423.6	1,478.1
Non-U.S. | Application Software
Segment Reporting Information [Line Items]
Net revenues									289.9	267.7	264.5
Non-U.S. | Network Software & Systems
Segment Reporting Information [Line Items]
Net revenues									208.5	173.6	138.1
Non-U.S. | Measurement &Analytical Solutions
Segment Reporting Information [Line Items]
Net revenues									514.6	632.0	718.2
Non-U.S. | Process Technologies
Segment Reporting Information [Line Items]
Net revenues									$ 291.6	$ 350.3	$ 357.3

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