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Income Taxes - Reconciliation of Provision for Income Taxes with Federal Statutory Income Tax Rate (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | $ 132.4 | $ 124.9 | $ 102.7
State income taxes - net of Federal benefit | 5.3 | 5.3 | 10.2
Differences related to non U.S. operations | (48.5) | (34.1) | (22.6)
Alternative energy, foreign and other tax credits | (230.1) | (194.4) | (181.3)
Other permanent differences | (10.6) | (4.8) | (4.9)
U.S. repatriation tax | 36.8 |  |
Stock-based compensation | (15.1) |  |
Changes in unrecognized tax benefits | (0.9) | 2.2 | 3.0
Change in valuation allowance | 12.3 | 14.0 | 1.7
Change in U.S. and U.K. tax rates | (2.2) | (1.5) | (4.2)
Other | (0.5) | 0.3 | (0.2)
Benefit for income taxes | $ (121.1) | $ (88.1) | $ (95.6)
Federal statutory rate, % of Pretax Earnings | 35.00% | 35.00% | 35.00%
State income taxes-net of Federal benefit, % of Pretax Earnings | 1.40% | 1.50% | 3.50%
Differences related to non U.S. operations, % of Pretax Earnings | (12.80%) | (9.60%) | (7.70%)
Alternative energy, foreign and other tax credits, % of Pretax Earnings | (60.90%) | (54.50%) | (61.80%)
Other permanent differences, % of Pretax Earnings | (2.80%) | (1.30%) | (1.70%)
U.S. repatriation tax | 9.70% |  |
Stock-based compensation | (4.00%) |  |
Changes in unrecognized tax benefits, % of Pretax Earnings | (0.20%) | 0.60% | 1.00%
Change in valuation allowance, % of Pretax Earnings | 3.30% | 3.90% | 0.60%
Change in U.S. and U.K. tax rates | (0.60%) | (0.40%) | (1.40%)
Other, % of Pretax Earnings | (0.10%) | 0.10% | (0.10%)
Total benefit for income taxes-continuing operations, % of Pretax Earnings | (32.00%) | (24.70%) | (32.60%)

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