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Reconciliation of Operating Income (Loss) to Income from Continuing Operations Before Income Tax (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting [Abstract]        
Operating income from segments $ 115.5 $ 63.5 $ 216.6 $ 115.4
Non-operating income and (expense) (23.4) (27.5) (48.5) (52.8)
Income before income taxes $ 92.1 $ 36.0 $ 168.1 $ 62.6