Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended			3 Months Ended
	Oct. 01, 2021	Apr. 29, 2022	Jun. 30, 2021	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Feb. 07, 2022	Dec. 31, 2021	Aug. 31, 2021	Jun. 14, 2021	Jan. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capital stock, issued (in shares)					681,463,527			683,139,210
Capital stock, par value (in dollars per share)					$ 0			$ 0
Treasury stock (in shares)					2,488,897			547,136
Preferred Stock, Liquidation Preference Per Share										$ 100.00
Treasury stock sold, average cost per share (in dollars per share)					$ 15.01
Treasury stock acquired, average cost per share (in dollars per share)	$ 30.99				$ 16.16
Stock repurchase program, authorized amount							$ 1,000.0		$ 250.0
Stock repurchased and retired (in shares)					2,100,000
Treasury Stock Retired, Average Cost Per Share					$ 15.71
Treasury Stock, Retired, Cost Method, Amount					$ (33.3)
Stock repurchase program, remaining authorized repurchase amount					$ 933.6
Treasury Stock, Shares, Acquired					4,100,000
Treasury Stock, Common, Value					$ 48.7			$ 16.9
Treasury Stock, Value, Acquired, Par Value Method					66.4
Other accrued expenses and other current liabilities					$ 206.1			$ 158.4
Capital stock, outstanding (in shares)					678,974,630			683,139,210
Treasury Stock, Value, Acquired, Cost Method, Settled in Subsequent Period					$ 11.3
Treasury stock sold at lower than repurchase price					$ (0.6)
Stock Issued During Period, Shares, Treasury Stock Reissued					41,700
Common Stock, Voting Rights					one
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock acquired, average cost per share (in dollars per share)		$ 16.43
Stock repurchased and retired (in shares)		3,300,000
Treasury Stock Retired, Average Cost Per Share		$ 16.72
Treasury Stock, Retired, Cost Method, Amount		$ (55.1)
Stock repurchase program, remaining authorized repurchase amount		$ 825.0
Treasury Stock, Shares, Acquired		6,600,000
Treasury Stock, Value, Acquired, Par Value Method		$ 108.6
CPA Global
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Newly issued ordinary shares (in shares)						1,500,000
Newly issued ordinary shares, value											$ 43.9
Decision Resources Group
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Newly issued ordinary shares (in shares)				2,900,000		2,900,000
Newly issued ordinary shares, value				$ 61.6		$ 61.6
Treasury Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury stock (in shares)				6,300,000	2,500,000	6,300,000		500,000				6,300,000
Stock repurchased and retired (in shares)					2,100,000
Treasury Stock, Retired, Cost Method, Amount					$ 33.3
Treasury Stock, Shares, Acquired					4,100,000
Treasury Stock, Value				$ (196.0)	$ 48.7	$ (196.0)		$ 16.9				$ (196.0)
Treasury Stock, Value, Acquired, Par Value Method					66.4
Treasury stock sold at lower than repurchase price					$ (1.3)
Stock Issued During Period, Shares, Treasury Stock Reissued					0
Accumulated Deficit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Retired, Cost Method, Amount					$ 1.5
Treasury stock sold at lower than repurchase price					$ 0.7
Ordinary Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock Dividends, Shares					0
Stock repurchased and retired (in shares)					0
Treasury Stock, Retired, Cost Method, Amount					$ (34.8)
Treasury Stock, Shares, Acquired					4,100,000
Capital stock, outstanding (in shares)				611,300,000	679,000,000.0	611,300,000						606,300,000
Stock Issued During Period, Shares, Treasury Stock Reissued					0
Preferred Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued (in shares)			14,400,000
Preferred Stock, Dividend Rate, Percentage					5.25%
Dividends Payable					$ 6.4
Preferred Shares | Over-Allotment Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued (in shares)			1,900,000