Schedule - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for Doubtful Accounts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 65.0	$ 65.7	$ 60.2
Additions Charged (Credited) to Expense	21.8	5.5	10.7
Deductions / Other Additions to Reserve	(12.7)	(5.3)	(3.6)
Effects of Foreign Currency	1.7	(0.9)	(1.6)
Balance at End of Period	75.8	65.0	65.7
Deferred Tax Asset Valuation Allowances [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	546.1	390.9	140.6
Additions Charged (Credited) to Expense	(3.8)	(6.6)	48.2
Deductions / Other Additions to Reserve	(3.2)	165.7	206.2
Effects of Foreign Currency	3.0	(3.9)	(4.1)
Balance at End of Period	$ 542.1	$ 546.1	$ 390.9