Segment and Geographic Area Information (Schedule of Revenue by Geographic Area) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net revenues	$ 1,512.3	$ 1,462.8	$ 1,426.6	$ 1,376.1	$ 1,335.6	$ 1,198.2	$ 1,137.8	$ 1,182.6	$ 5,777.8	$ 4,854.2	$ 4,727.7
Canada
Segment Reporting Information [Line Items]
Net revenues									224.2	207.3	214.0
Canada | Application Software
Segment Reporting Information [Line Items]
Net revenues									51.2	43.4	41.0
Canada | Network Software & Systems
Segment Reporting Information [Line Items]
Net revenues									86.7	75.6	70.1
Canada | Measurement &Analytical Solutions
Segment Reporting Information [Line Items]
Net revenues									69.5	71.1	80.7
Canada | Process Technologies
Segment Reporting Information [Line Items]
Net revenues									16.8	17.2	22.2
Europe
Segment Reporting Information [Line Items]
Net revenues									688.6	603.6	625.3
Europe | Application Software
Segment Reporting Information [Line Items]
Net revenues									248.2	205.5	188.8
Europe | Network Software & Systems
Segment Reporting Information [Line Items]
Net revenues									71.1	60.2	35.7
Europe | Measurement &Analytical Solutions
Segment Reporting Information [Line Items]
Net revenues									284.9	250.7	299.7
Europe | Process Technologies
Segment Reporting Information [Line Items]
Net revenues									84.4	87.2	101.1
Asia
Segment Reporting Information [Line Items]
Net revenues									237.6	206.4	280.6
Asia | Application Software
Segment Reporting Information [Line Items]
Net revenues									3.7	3.3	3.5
Asia | Network Software & Systems
Segment Reporting Information [Line Items]
Net revenues									13.6	13.1	12.4
Asia | Measurement &Analytical Solutions
Segment Reporting Information [Line Items]
Net revenues									135.1	116.0	177.6
Asia | Process Technologies
Segment Reporting Information [Line Items]
Net revenues									85.2	74.0	87.1
Rest of the world
Segment Reporting Information [Line Items]
Net revenues									191.8	179.3	195.8
Rest of the world | Application Software
Segment Reporting Information [Line Items]
Net revenues									37.1	37.7	34.4
Rest of the world | Network Software & Systems
Segment Reporting Information [Line Items]
Net revenues									10.5	10.9	8.2
Rest of the world | Measurement &Analytical Solutions
Segment Reporting Information [Line Items]
Net revenues									56.4	58.9	55.4
Rest of the world | Process Technologies
Segment Reporting Information [Line Items]
Net revenues									87.8	71.8	97.8
Non-U.S.
Segment Reporting Information [Line Items]
Net revenues									1,342.2	1,196.6	1,315.7
Non-U.S. | Application Software
Segment Reporting Information [Line Items]
Net revenues									340.2	289.9	267.7
Non-U.S. | Network Software & Systems
Segment Reporting Information [Line Items]
Net revenues									181.9	159.8	126.4
Non-U.S. | Measurement &Analytical Solutions
Segment Reporting Information [Line Items]
Net revenues									545.9	496.7	613.4
Non-U.S. | Process Technologies
Segment Reporting Information [Line Items]
Net revenues									$ 274.2	$ 250.2	$ 308.2