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Fair value of financial instruments (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 15, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) derivative_instrument | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) derivative_instrument | Jul. 26, 2023 USD ($) | Jun. 30, 2023 derivative_instrument | Dec. 31, 2022 USD ($) Instruments | Oct. 03, 2022 USD ($) | Jul. 21, 2022 USD ($) | Jul. 12, 2022 USD ($) derivative_instrument | Mar. 31, 2022 derivative_instrument | Jun. 30, 2021 derivative_instrument | Mar. 31, 2019 derivative_instrument
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other operating income (expense) |  | $ (1.3) | $ 15.7 | $ 3.2 | $ 18.4 |  |  |  |  |  |  |  |  |
Foreign currency transaction gains |  |  |  | (23.9) | (24.4) |  |  |  |  |  |  |  |  |
Interest expense |  | 53.8 | 34.7 | 151.5 | 95.0 |  |  |  |  |  |  |  |  |
Cash proceeds from settlement of cross currency swap |  |  |  | 0.0 | 64.3 |  |  |  |  |  |  |  |  |
Contingent consideration payment |  |  |  | 10.5 | 2.8 |  |  |  |  |  |  |  |  |
G4S |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | 22.0 |  | 22.0 |  |  |  |  |  |  |  |  |  |
NoteMachine |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  | $ 14.8 |  |  |  |  |
NoteMachine | ATM Cash Withdrawal Interchange Fees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  | 4.3 |  |  |  |  |
Contingent consideration derecognition gain |  |  |  | 4.8 |  |  |  |  |  |  |  |  |  |
NoteMachine | Post-Acquisition Collection of ATM Tax Rate Rebates |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  | $ 10.5 |  |  |  |  |
Contingent consideration payment |  |  |  | 9.7 |  |  |  |  |  |  |  |  |  |
Not Designated as Hedging Instrument | Foreign Exchange Contract |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional value of nonderivative instruments |  |  |  | $ 574.0 |  |  |  |  |  |  |  |  |  |
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 |  | 4.3 | 25.4 | $ 22.9 | 58.4 |  |  |  |  |  |  |  |  |
Not Designated as Hedging Instrument | Foreign Exchange Contract | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of derivative instruments, net |  | 6.3 |  | 6.3 |  |  |  | $ (7.0) |  |  |  |  |  |
Designated as Hedging Instrument | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net derivative instrument (gains) losses included in interest expense |  | (6.6) | (1.1) | $ (18.5) | 0.0 |  |  |  |  |  |  |  |  |
Designated as Hedging Instrument | Currency Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average maturity |  |  |  | 1 month 6 days |  |  |  |  |  |  |  |  |  |
Notional value of derivative instrument |  | 30.0 |  | $ 30.0 |  |  |  |  |  |  |  |  |  |
Other operating income (expense) |  | 0.5 | (0.3) | 7.7 | 6.2 |  |  |  |  |  |  |  |  |
Foreign currency transaction gains |  | 0.5 | (0.3) | 7.7 | 6.2 |  |  |  |  |  |  |  |  |
Interest expense |  | 0.2 | 0.3 | 0.7 | 1.0 |  |  |  |  |  |  |  |  |
Foreign currency derivative instrument gains (losses) |  | (0.7) | 0.0 | (8.4) | (7.2) |  |  |  |  |  |  |  |  |
Designated as Hedging Instrument | Currency Swap | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of contract, asset position |  | 7.2 |  | $ 7.2 |  |  |  | 14.6 |  |  |  |  |  |
Designated as Hedging Instrument | $400 million interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average maturity |  |  |  | 2 months 12 days |  |  |  |  |  |  |  |  |  |
Notional value of derivative instrument |  | 400.0 |  | $ 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 |  | 4.1 |  | 4.1 |  |  |  | 10.0 |  |  |  |  |  |
Net derivative instrument (gains) losses included in interest expense |  | (5.4) | 0.2 | $ (14.4) | $ 4.4 |  |  |  |  |  |  |  |  |
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 |  |  |  | 1 year 10 months 24 days |  |  |  |  |  |  |  |  |  |
Notional value of derivative instrument |  | 200.0 |  | $ 200.0 |  |  |  |  |  |  |  |  |  |
Number of instruments held | derivative_instrument |  |  | 3 |  | 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 |  | 18.4 |  | $ 18.4 |  |  |  | $ 16.4 |  | $ 9.2 |  |  |  |
Designated as Hedging Instrument | $175 million interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average maturity |  |  |  | 1 year 10 months 24 days |  |  |  |  |  |  |  |  |  |
Notional value of derivative instrument |  | 175.0 |  | $ 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, asset position |  | 5.0 |  | $ 5.0 |  |  |  |  |  |  |  |  |  |
Fair value of swap, net |  |  |  |  |  |  |  | $ 1.0 |  |  |  |  |  |
Designated as Hedging Instrument | $400 million interest rate swap 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average maturity |  |  |  | 2 years 1 month 6 days |  |  |  |  |  |  |  |  |  |
Notional value of derivative instrument |  | 400.0 |  | $ 400.0 |  |  |  |  |  |  |  |  |  |
Number of instruments held | derivative_instrument |  |  |  |  |  |  | 8 |  |  |  |  |  |  |
Designated as Hedging Instrument | $400 million interest rate swap 2023 | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of swap, asset position |  | 14.8 |  | 14.8 |  |  |  |  |  |  |  |  |  |
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 |  |  | $ (1.3) |  | $ (4.4) |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 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 |  | 17.3 |  | 17.3 |  |  |  | 11.7 |  |  |  |  |  |
Net derivative instrument (gains) losses included in interest expense |  | (1.2) |  | $ (4.1) |  |  |  |  |  |  |  |  |  |
Designated as Hedging Instrument | $215 million cross currency swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average maturity |  |  |  | 2 years 1 month 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 3 months 18 days |  |  |  |  |  |  |  |  |  |
Notional value of derivative instrument |  |  |  |  |  |  |  |  |  |  | $ 185.0 |  |  |
Designated as Hedging Instrument | $215 million cross currency swap II |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional value of derivative instrument |  |  |  |  |  | $ 215.0 |  |  |  |  |  |  |  |
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 |  | 9.2 |  | $ 9.2 |  |  |  | 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 |  | 7.0 |  | 7.0 |  |  |  | 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 |  | 3.0 |  | 3.0 |  |  |  | 2.0 |  |  |  |  |  |
Prepaid expenses and other | Designated as Hedging Instrument | $400 million interest rate swap 2023 | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of swap, asset position |  | 5.6 |  | 5.6 |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 5.6 |  |  |  |  |  |
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 |  | 2.9 |  | 2.9 |  |  |  | 10.5 |  |  |  |  |  |
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 |  | 11.4 |  | 11.4 |  |  |  | 10.4 |  |  |  |  |  |
Other assets | Designated as Hedging Instrument | $175 million interest rate swap | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of swap, asset position |  | 2.0 |  | 2.0 |  |  |  |  |  |  |  |  |  |
Other assets | Designated as Hedging Instrument | $400 million interest rate swap 2023 | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of swap, asset position |  | 9.2 |  | 9.2 |  |  |  |  |  |  |  |  |  |
Other assets | Designated as Hedging Instrument | $215 million cross currency swap II | Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of contract, asset position |  | 2.6 |  | 2.6 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 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 |  | 22.9 |  | 22.9 |  |  |  | 17.3 |  |  |  |  |  |
Six hundred million senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 600.0 |  | 600.0 |  |  |  | 600.0 |  |  |  |  |  |
Six hundred million senior unsecured notes | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value |  | 520.2 |  | 520.2 |  |  |  | 528.7 |  |  |  |  |  |
Four hundred million senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value |  | 400.0 |  | 400.0 |  |  |  | 400.0 |  |  |  |  |  |
Four hundred million senior unsecured notes | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value |  | $ 372.3 |  | $ 372.3 |  |  |  | $ 369.0 |  |  |  |  |  |

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