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Credit losses Credit losses (Details) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) country | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
Valuation Allowance [Line Items] |  |  |
Number of Countries in which Entity Operates | country | 100 |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for doubtful accounts, beginning balance | $ 30.2 |  |
Retained earnings | 455.2 |  | $ 457.4
Provision for uncollectible accounts receivable(a) | 13.1 |  |
Write-offs less recoveries | (1.4) |  |
Foreign currency exchange effects | (0.7) |  |
Allowance for doubtful accounts, ending balance | 43.5 |  |
Internal Loss AR Rebuild |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Provision for uncollectible accounts receivable(a) | 10.6 |  |
Allowance for doubtful accounts, ending balance | $ 21.6 |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Retained earnings |  | $ 2.3 |

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