Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation between Provision for Income Taxes at Statutory Rate and Provision for Income Taxes at Effective Tax Rate (Detail)

v3.10.0.1
Income Taxes - Reconciliation between Provision for Income Taxes at Statutory Rate and Provision for Income Taxes at Effective Tax Rate (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]        
Tax expense at United States statutory rate   $ 97.4 $ 164.9 $ 127.7
Increase (decrease) in tax resulting from:        
Differences between U.S. and foreign tax rates on foreign income, including withholding taxes   31.0 (42.7) (16.6)
U.S. tax (benefit) on foreign income, net of foreign tax credits   (0.8) (22.9) (10.2)
Increase (decrease) in valuation allowances $ 29.5 83.7 183.7 (5.6)
State taxes, net of federal benefit   (1.5) 1.9 0.3
Unrecognized tax benefits   6.9 (4.0) 5.3
Excess tax benefits on equity awards   (53.1) (31.1) (0.4)
Other   4.0 7.5 3.8
Total   $ 167.6 $ 257.3 $ 104.7