Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions		3 Months Ended
	Feb. 28, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Net consideration		$ 15.9	$ 0.0
Goodwill		$ 548.0		$ 543.9
AutoCoding Systems
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Financial assets	$ 3.0
Inventories	0.8
Property, plant and equipment	0.1
Other intangible assets	9.9
Deferred taxes	(1.9)
Financial liabilities	(2.7)
Total identifiable net assets	9.2
Cash consideration paid	17.0
Cash acquired	1.1
Net consideration	15.9
Goodwill	7.8
Goodwill expected to be tax deductible	0.7
AutoCoding Systems | Customer Relationships
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Other intangible assets	$ 4.4
Intangible assets useful lives	13 years
AutoCoding Systems | Technology-Based Intangible Assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Other intangible assets	$ 4.8
Intangible assets useful lives	7 years
AutoCoding Systems | Trade Names
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Other intangible assets	$ 0.7
Intangible assets useful lives	18 years