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Fair value of financial instruments (Details) $ in Millions		3 Months Ended
Fair value of financial instruments (Details) $ in Millions	Jul. 15, 2022 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($) derivative_instrument	Mar. 31, 2022 USD ($) derivative_instrument	Dec. 31, 2022 USD ($) Instruments	Oct. 03, 2022 USD ($)	Jul. 21, 2022 USD ($)	Jul. 12, 2022 USD ($) derivative_instrument	Jun. 30, 2021 derivative_instrument	Sep. 30, 2019 derivative_instrument
Debt Securities, Available-for-sale [Line Items]
Other operating income (expense)		$ 8.3		$ 0.3
Foreign currency transaction gains		(9.8)		(4.9)
Interest expense		46.6		27.9
G4S
Debt Securities, Available-for-sale [Line Items]
Contingent consideration		22.0
NoteMachine
Debt Securities, Available-for-sale [Line Items]
Contingent consideration						$ 10.1
NoteMachine \| ATM Cash Withdrawal Interchange Fees
Debt Securities, Available-for-sale [Line Items]
Contingent consideration						4.3
NoteMachine \| Post-Acquisition Collection of ATM Tax Rate Rebates
Debt Securities, Available-for-sale [Line Items]
Contingent consideration						$ 10.5
Not Designated as Hedging Instrument \| Foreign Exchange Contract
Debt Securities, Available-for-sale [Line Items]
Notional value of nonderivative instruments		$ 479.0
Weighted average maturity		1 month
Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Other operating income (expense)
Debt Securities, Available-for-sale [Line Items]
Gain (loss) on foreign currency contract		$ 8.2		18.9
Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of derivative instruments, net		0.3			$ (7.0)
Designated as Hedging Instrument \| Level 2
Debt Securities, Available-for-sale [Line Items]
Net derivative instrument (gains) losses included in interest expense		$ (5.4)		0.9
Designated as Hedging Instrument \| Currency Swap
Debt Securities, Available-for-sale [Line Items]
Weighted average maturity		4 months 24 days
Notional value of derivative instrument		$ 47.0
Other operating income (expense)		3.4		11.8
Foreign currency transaction gains		3.4		11.8
Interest expense		0.3		0.4
Foreign currency derivative instrument gains (losses)		(3.7)		(12.2)
Designated as Hedging Instrument \| Currency Swap \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of contract, asset position		$ 11.6			14.6
Designated as Hedging Instrument \| $400 million interest rate swap
Debt Securities, Available-for-sale [Line Items]
Weighted average maturity		6 months
Notional value of derivative instrument		$ 400.0
Number of instruments held \| derivative_instrument										10
Designated as Hedging Instrument \| $400 million interest rate swap \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of swap, asset position		7.7			10.0
Net derivative instrument (gains) losses included in interest expense		$ (4.0)		$ 2.4
Designated as Hedging Instrument \| $200 million interest rate swap
Debt Securities, Available-for-sale [Line Items]
Number of instruments held \| derivative_instrument				4
Designated as Hedging Instrument \| $200 million interest rate swap \| Gains (losses) on cash flow hedges
Debt Securities, Available-for-sale [Line Items]
Cumulative net gain in AOCI			$ 9.2
Designated as Hedging Instrument \| $200 million interest rate swap amended
Debt Securities, Available-for-sale [Line Items]
Weighted average maturity		2 years 2 months 12 days
Notional value of derivative instrument		$ 200.0
Number of instruments held \| derivative_instrument			3
Designated as Hedging Instrument \| $200 million interest rate swap amended \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of swap, asset position		$ 12.8			$ 16.4		$ 9.2
Designated as Hedging Instrument \| $175 million interest rate swap
Debt Securities, Available-for-sale [Line Items]
Weighted average maturity		2 years 2 months 12 days
Notional value of derivative instrument		$ 175.0
Number of instruments held \| Instruments					2
Designated as Hedging Instrument \| $175 million interest rate swap \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of swap, net		1.5			$ 1.0
Designated as Hedging Instrument \| $400 million cross currency swap
Debt Securities, Available-for-sale [Line Items]
Number of instruments held \| derivative_instrument									10
Cash proceeds from settlement of cross currency swap	$ 67.0
Designated as Hedging Instrument \| $400 million cross currency swap \| Level 2
Debt Securities, Available-for-sale [Line Items]
Net derivative instrument (gains) losses included in interest expense				$ (1.5)
Designated as Hedging Instrument \| $400 million cross currency swap 2022
Debt Securities, Available-for-sale [Line Items]
Notional value of derivative instrument		400.0						$ 400.0
Number of instruments held \| derivative_instrument								9
Designated as Hedging Instrument \| $400 million cross currency swap 2022 \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of contract, liability position		14.9			11.7
Net derivative instrument (gains) losses included in interest expense		$ (1.4)
Designated as Hedging Instrument \| $215 million cross currency swap
Debt Securities, Available-for-sale [Line Items]
Weighted average maturity		2 years 7 months 6 days
Notional value of derivative instrument								$ 215.0
Designated as Hedging Instrument \| $185 million cross currency swap
Debt Securities, Available-for-sale [Line Items]
Weighted average maturity		6 years 6 months
Notional value of derivative instrument								$ 185.0
Prepaid expenses and other \| Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of derivative instruments, asset		$ 4.0			3.5
Prepaid expenses and other \| Designated as Hedging Instrument \| $400 million interest rate swap \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of swap, asset position					9.3
Prepaid expenses and other \| Designated as Hedging Instrument \| $200 million interest rate swap amended \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of swap, asset position		5.6			6.0
Prepaid expenses and other \| Designated as Hedging Instrument \| $175 million interest rate swap \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of swap, asset position		1.8			2.0
Prepaid expenses and other \| Designated as Hedging Instrument \| $400 million cross currency swap 2022 \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of contract, liability position		5.6			5.6
Other assets \| Designated as Hedging Instrument \| $400 million interest rate swap \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of swap, asset position					0.7
Other assets \| Designated as Hedging Instrument \| $200 million interest rate swap amended \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of swap, asset position		7.2			10.4
Accrued liabilities \| Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of derivative instruments, liability		3.7			10.5
Other liabilities \| Designated as Hedging Instrument \| $175 million interest rate swap \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of swap, liability position		3.3			1.0
Other liabilities \| Designated as Hedging Instrument \| $400 million cross currency swap 2022 \| Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of contract, liability position		20.5			17.3
Six hundred million senior unsecured notes
Debt Securities, Available-for-sale [Line Items]
Carrying value		600.0			600.0
Six hundred million senior unsecured notes \| Level 3
Debt Securities, Available-for-sale [Line Items]
Fair value		538.0			528.7
Four hundred million senior unsecured notes
Debt Securities, Available-for-sale [Line Items]
Carrying value		400.0			400.0
Four hundred million senior unsecured notes \| Level 3
Debt Securities, Available-for-sale [Line Items]
Fair value		$ 376.2			$ 369.0