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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting [Abstract]        
Operating income from segments $ 63.5 $ 51.4 $ 115.4 $ 87.9
Non-operating income and expense (27.5) (46.7) (52.8) (90.6)
Income (loss) before income taxes $ 36.0 $ 4.7 $ 62.6 $ (2.7)