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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
	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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Effective income tax rate reconciliation, Changes in unrecognized tax benefits related to resolution of Federal and state audits, expiration of various statutes of limitations and other items

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