Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income (loss) from continuing operations:
United States	$ 69.6	$ 68.8	$ 14.0
Foreign	10.0	(32.7)	25.4
Income from continuing operations before income taxes	79.6	36.1	39.4
Current:
United States	1.5	30.4	(4.3)
Foreign	(3.2)	(3.5)	(4.8)
Total current	(1.7)	26.9	(9.1)
Deferred and other:
United States	0.6	23.5	0.2
Foreign	(0.3)	(2.5)	(0.2)
Total deferred and other	0.3	21.0	0.0
Total (provision) benefit	$ (1.4)	$ 47.9	$ (9.1)
Reconciliation of the U.S. federal statutory tax rate to effective income tax rate
Tax at U.S. federal statutory rate (as a percent)	21.00%	35.00%	35.00%
State and local taxes, net of U.S. federal benefit (as a percent)	2.90%	4.40%	5.00%
U.S. credits and exemptions (as a percent)	(4.00%)	(8.50%)	(12.90%)
Foreign earnings taxed at lower rates (as a percent)	(1.20%)	(14.90%)	(5.90%)
Nondeductible expense (percent)	2.60%	2.80%	2.20%
Adjustments to uncertain tax positions (as a percent)	(8.90%)	(9.80%)	(1.90%)
Changes in valuation allowance (as a percent)	(8.50%)	54.40%	17.40%
Tax on distributions of foreign earnings (as a percent)	(2.40%)	(1.70%)	0.00%
Goodwill impairment and basis adjustments (as a percent)	(0.00%)	(226.30%)	(0.00%)
Disposition of dry cooling business (as a percent)	0.00%	0.00%	(15.60%)
U.S. tax reform (as a percent)	(0.90%)	32.60%	0.00%
Other (as a percent)	1.20%	(0.70%)	(0.20%)
Effective income tax rate (as a percentage)	1.80%	(132.70%)	23.10%
Deferred tax assets:
NOL and credit carryforwards	$ 147.6	$ 146.0
Pension, other postretirement and postemployment benefits	37.1	41.2
Payroll and compensation	17.1	18.2
Legal, environmental and self-insurance accruals	22.7	25.3
Working capital accruals	12.4	11.5
Other	9.0	17.6
Total deferred tax assets	245.9	259.8
Valuation allowance	(89.3)	(110.9)
Net deferred tax assets	156.6	148.9
Deferred tax liabilities:
Intangible assets recorded in acquisitions	71.7	53.9
Basis difference in affiliates	12.2	3.7
Accelerated depreciation	25.2	28.8
Deferred income	18.9	4.9
Other	5.0	8.0
Total deferred tax liabilities	133.0	99.3
Total deferred tax assets	$ 23.6	$ 49.6

The tax effects as of the balance sheet date of the amount of excesses of tax deductions over taxable income in a year which cannot be used on the tax returns in the current year but may be carried forward to reduce taxable income or income taxes payable in a future year in certain jurisdictions and the tax effects arising from all unused tax credits available to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset.

No definition available.