Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Cost	$ 2,102.4	$ 2,175.3
Accumulated Amortization	(795.8)	(776.4)
Net	$ 1,306.6	$ 1,398.9
Technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	7 years	7 years
Cost	$ 510.0	$ 519.2
Accumulated Amortization	(298.3)	(291.9)
Net	$ 211.7	$ 227.3
Marketing
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	16 years	16 years
Cost	$ 252.3	$ 265.3
Accumulated Amortization	(95.7)	(94.3)
Net	$ 156.6	$ 171.0
Contract
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	6 years	6 years
Cost	$ 5.0	$ 5.0
Accumulated Amortization	(5.0)	(5.0)
Net	$ 0.0	$ 0.0
Customer
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	13 years	13 years
Cost	$ 876.6	$ 901.2
Accumulated Amortization	(289.3)	(278.0)
Net	$ 587.3	$ 623.2
Database
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (in years)	19 years	19 years
Cost	$ 458.5	$ 484.6
Accumulated Amortization	(107.5)	(107.2)
Net	$ 351.0	$ 377.4