Segment and Geographic Area Information - Sales and Long-Lived Assets by Country of Origin (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net revenues	$ 1,376.3	$ 1,318.7	$ 1,293.7	$ 1,202.5	$ 1,226.6	$ 1,159.9	$ 1,134.7	$ 1,086.3	$ 5,191.2	$ 4,607.5	$ 3,789.9
Long-lived assets	175.2				175.4				175.2	175.4	167.0
Scientific Imaging businesses | Disposal group, held-for-sale, not discontinued operations
Segment Reporting Information [Line Items]
Long-lived assets classified as held for sale	7.6								7.6
Sales to unaffiliated customers
Segment Reporting Information [Line Items]
Net revenues									5,191.2	4,607.5	3,789.9
Sales between geographic areas
Segment Reporting Information [Line Items]
Net revenues									0.0	0.0	0.0
Non-U.S.
Segment Reporting Information [Line Items]
Net revenues									1,478.1	1,341.2	1,175.0
Reportable Geographical Components | United States
Segment Reporting Information [Line Items]
Net revenues									4,320.1	3,812.3	3,115.8
Long-lived assets	145.2				144.0				145.2	144.0	146.0
Reportable Geographical Components | United States | Sales to unaffiliated customers
Segment Reporting Information [Line Items]
Net revenues									4,176.2	3,679.1	2,978.5
Reportable Geographical Components | United States | Sales between geographic areas
Segment Reporting Information [Line Items]
Net revenues									143.9	133.2	137.3
Reportable Geographical Components | Non-U.S.
Segment Reporting Information [Line Items]
Net revenues									1,152.0	1,116.1	920.8
Long-lived assets	30.0				31.4				30.0	31.4	21.0
Reportable Geographical Components | Non-U.S. | Sales to unaffiliated customers
Segment Reporting Information [Line Items]
Net revenues									1,015.0	928.4	811.4
Reportable Geographical Components | Non-U.S. | Sales between geographic areas
Segment Reporting Information [Line Items]
Net revenues									137.0	187.7	109.4
Eliminations
Segment Reporting Information [Line Items]
Net revenues									(280.9)	(320.9)	(246.7)
Long-lived assets	$ 0.0				$ 0.0				0.0	0.0	0.0
Eliminations | Sales to unaffiliated customers
Segment Reporting Information [Line Items]
Net revenues									0.0	0.0	0.0
Eliminations | Sales between geographic areas
Segment Reporting Information [Line Items]
Net revenues									$ (280.9)	$ (320.9)	$ (246.7)