Other Assets and Liabilities - Other Accrued and Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Operating expenses accruals	$ 88.5		$ 75.7
Accrued interest expense	29.0		29.0
Short-term lease liability	28.6		23.4
Other accrued liabilities	21.1		23.0
Total	167.2		$ 151.1	[1]
China
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term lease liability related to a new lease and a lease modified during period		$ 0.6
Bisnode
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term lease liability related to a new lease and a lease modified during period	$ 8.4

[1] See discussion in Note 1 - Basis of Presentation for further detail regarding the elimination of the International lag reporting.