Discontinued Operations (Schedule of Amounts Included in Discontinued Operations) (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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Earnings from discontinued operations, net of tax									$ 114.1	$ 124.2	$ 127.9
Gain on disposition of discontinued operations, net of tax									55.9	0.0	0.0
Net earnings from discontinued operations	$ 87.9	$ 29.7	$ 33.3	$ 19.1	$ 30.8	$ 27.4	$ 35.2	$ 30.8	170.0	124.2	127.9
Depreciation and amortization									5.2	7.9	7.2
Held-for-sale or Disposed of by Sale | TransCore and Zetec and CIVCO Radiotherapy
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues									638.0	672.9	639.1
Cost of sales									372.9	400.7	352.1
Gross profit									265.1	272.2	287.0
Selling, general and administrative expenses									124.0	114.6	116.9
Income from operations									141.1	157.6	170.1
Other income (expense), net									1.5	0.3	(0.1)
Earnings before income taxes (2)									142.6	157.9	170.0
Income taxes									28.5	33.7	42.1
Earnings from discontinued operations, net of tax									114.1	124.2	127.9
Gain on disposition of discontinued operations, net of tax									55.9	0.0	0.0
Net earnings from discontinued operations									170.0	124.2	127.9
Stock-based compensation expense									5.4	$ 4.8	$ 3.4
Held-for-sale or Disposed of by Sale | Civco Radiotherapy
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposition of discontinued operations, net of tax									$ 0.9