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Income Taxes - Reconciliation of Income Taxes at Federal Statutory Income Tax Rate (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation Of Income Taxes [Line Items]      
Income tax expense computed at federal statutory income tax rate $ 161.0 $ 137.2 $ 108.7
Other income taxes, net of federal tax benefit 9.4 7.2 7.0
Foreign taxes at a different rate than U.S. federal statutory income tax rate (8.7) (13.4) (10.1)
Tax benefit on income attributable to domestic production activities (12.5) (7.6) (5.2)
Net adjustments for uncertain tax positions 4.7 4.7 3.0
Net effect of rate changes on deferred taxes 0.2 (0.7) (1.6)
Valuation allowance increase (decrease) 0.8 (4.1) 2.1
Miscellaneous other, net (1.5) (5.0) (2.4)
Income tax expense as reported $ 153.4 $ 118.3 $ 101.5
Effective income tax rate 33.40% 30.20% 32.70%