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Fair value of financial instruments (Tables) | 6 Months Ended
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Jun. 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 are as follows:
(In millions) | June 30, 2020 |  | December 31, 2019
$600 million Senior unsecured notes |  |  |
Carrying value | $ | 600.0 |  |  | 600.0 |
Fair value | 581.7 |  |  | 624.7 |
$400 million Senior unsecured notes |  |  |  |  |
Carrying value | 400.0 |  |  | — |
Fair value | 394.9 |  |  | — |
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 June 30, |  | Six Months Ended June 30,
(In millions) | 2020 |  | 2019 |  | 2020 |  | 2019
Derivative instrument gains (losses) included in other operating income (expense) | $ | 2.6 |  |  | (1.4 | ) |  | $ | 3.9 |  |  | 2.5 |
Derivative instrument gains (losses) included in other nonoperating income (expense)(a) | (0.4 | ) |  | — |  |  | (8.1 | ) |  | — |
(a) Represents loss 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 June 30, |  | Six Months Ended June 30,
(In millions) | 2020 |  | 2019 |  | 2020 |  | 2019
Derivative instrument gains (losses) included in other operating income (expense) | $ | 3.7 |  |  | (2.4 | ) |  | $ | 29.8 |  |  | 1.4 |
Offsetting transaction gains (losses) | (3.7 | ) |  | 2.4 |  |  | (29.8 | ) |  | (1.4 | )
Derivative instrument gains (losses) included in interest expense | (0.3 | ) |  | (1.3 | ) |  | (1.0 | ) |  | (2.7 | )
Net gain (loss) on derivative instrument | 3.4 |  |  | (3.7 | ) |  | 28.8 |  |  | (1.3 | )
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 June 30, 2020 |  | Six Months Ended June 30, 2020
Derivative instrument losses included in interest expense | $ | 2.1 |  |  | 2.9 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of derivative instruments (including nonderivative instruments that are designated and qualify as hedging instruments) of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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