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Fair value of financial instruments (Tables)
 9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
The fair value and carrying value of our material fixed-rate debt is as follows:
(In millions)September 30, 2020December 31, 2019
$600 million Senior unsecured notes  
Carrying value$600.0 600.0 
Fair value611.7 624.7 
$400 million Senior unsecured notes  
Carrying value400.0 — 
Fair value410.5 — 
Derivatives Not Designated as Hedging Instruments [Table Text Block]
Amounts under these contracts were recognized in other operating income (expense) and in interest and other nonoperating income and expense as follows:
Three Months
Ended September 30,		Nine Months
Ended September 30,
(In millions)2020201920202019
Derivative instrument gains (losses) included in other operating income (expense)$(3.4)5.8 $0.5 8.3 
Derivative instrument losses included in other nonoperating income (expense)(a)
(0.5)— (8.6)— 
(a)Represents losses on foreign currency forward contracts related to 2020 acquisition of business operations from G4S.
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]
Amounts under this contract were recognized in other operating income (expense) to offset transaction gains or losses and in interest expense as follows:
Three Months
Ended September 30,		Nine Months
Ended September 30,
(In millions)2020201920202019
Derivative instrument gains included in other operating income (expense)$0.8 8.9 $30.6 10.3 
Offsetting transaction losses(0.8)(8.9)(30.6)(10.3)
Derivative instrument losses included in interest expense(0.5)(1.3)(1.5)(4.0)
  Net derivative instrument gains0.3 7.6 29.1 6.3 
Schedule of Interest Rate Derivatives [Table Text Block]
The effect of these swaps is included in interest expense. The amounts recognized in the 2019 periods were not significant.
(In millions) Three Months Ended September 30, 2020Nine Months Ended September 30, 2020
Derivative instrument losses included in interest expense$2.3 5.2