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Recent accounting pronouncements and accounting changes - Schedule of Amounts Reclassified in Consolidated Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities |  |  |  |  |  |
Other assets |  | $ (27.5) | $ 16.5 | [1] | $ 18.1 | [1]
Cash flows from investing activities |  |  |  |  |  |
Other |  | (0.8) | (0.9) | [1] | 7.0 | [1]
Effect of exchange rate changes on cash, cash equivalents and restricted cash |  | 19.2 | (14.7) | [1] | (47.6) | [1]
Cash, cash equivalents and restricted cash, beginning of year | [1] | 401.1 | 396.8 |  | 530.2 |
Cash, cash equivalents and restricted cash, end of year |  | 764.1 | 401.1 | [1] | 396.8 | [1]
Accounting Standards Update 2016-18 |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |
Other assets |  |  | (1.9) |  | 2.6 |
Cash flows from investing activities |  |  |  |  |  |
Other |  |  | 1.6 |  | (2.3) |
Effect of exchange rate changes on cash, cash equivalents and restricted cash |  |  | (0.8) |  | (4.6) |
Cash, cash equivalents and restricted cash, beginning of year |  | $ 30.5 | 31.6 |  | 35.9 |
Cash, cash equivalents and restricted cash, end of year |  |  | $ 30.5 |  | $ 31.6 |
[1] | Amounts were changed to conform to the current-year presentation. See Note 5

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 + Details
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- Definition Amount of increase (decrease) from effect of exchange rate changes on cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; held in foreign currencies. Excludes amounts for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 + Details
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