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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
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