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Shareholders' Equity and Long-Term Incentive Compensation - AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Components of accumulated other comprehensive income, net of tax [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | $ 191.6 |  |
Other comprehensive Income (loss), net |  |  | 15.0 | $ (48.2) | $ (133.9)
Ending Balance |  |  | 314.7 | 191.6 |
Other Expense |  |  |  |  |
Accumulated Other Comprehensive income |  |  |  |  |
Gain on derivative |  |  | 2.7 |  |
Accum. Other Comprehensive Income |  |  |  |  |
Components of accumulated other comprehensive income, net of tax [Roll Forward] |  |  |  |  |
Beginning Balance |  | $ 283.3 | 235.1 | 283.3 |
Other comprehensive income before reclassifications |  |  | 19.1 | (10.8) |
Amounts reclassified from accumulated other comprehensive income |  |  | (4.1) | (37.4) |
Other comprehensive Income (loss), net |  |  | 15.0 | (48.2) | (133.9)
Ending Balance |  |  | 250.1 | 235.1 | 283.3
Foreign Currency Translation Adjustment |  |  |  |  |
Components of accumulated other comprehensive income, net of tax [Roll Forward] |  |  |  |  |
Beginning Balance |  | 280.6 | 229.7 | 280.6 |
Other comprehensive income before reclassifications |  |  | 0.5 | (11.9) |
Amounts reclassified from accumulated other comprehensive income |  |  | 0.0 | (39.0) |
Other comprehensive Income (loss), net |  |  | 0.5 | (50.9) |
Ending Balance |  |  | 230.2 | 229.7 | 280.6
Foreign Currency Translation Adjustment | Dry Cooling Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Gain on Sale of Dry Cooling Business |  |  |  |  |
Components of accumulated other comprehensive income, net of tax [Roll Forward] |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income |  | (40.4) |  |  |
Net Unrealized Losses on Qualifying Cash Flow Hedges |  |  |  |  |
Accumulated Other Comprehensive income |  |  |  |  |
Pension and postretirement liability adjustment and other, tax provision benefit |  |  | 0.5 | (0.9) | 0.8
Components of accumulated other comprehensive income, net of tax [Roll Forward] |  |  |  |  |
Beginning Balance |  | (1.8) | 1.5 | (1.8) |
Other comprehensive income before reclassifications |  |  | 2.3 | 1.1 |
Amounts reclassified from accumulated other comprehensive income |  |  | (3.0) | 2.2 |
Other comprehensive Income (loss), net |  |  | (0.7) | 3.3 |
Ending Balance |  |  | 0.8 | 1.5 | (1.8)
Pension and Postretirement Liability Adjustment and Other |  |  |  |  |
Accumulated Other Comprehensive income |  |  |  |  |
Pension and postretirement liability adjustment and other, tax provision benefit |  |  | 12.5 | 2.7 | 3.1
Components of accumulated other comprehensive income, net of tax [Roll Forward] |  |  |  |  |
Beginning Balance |  | $ 4.5 | 3.9 | 4.5 |
Other comprehensive income before reclassifications |  |  | 16.3 | 0.0 |
Amounts reclassified from accumulated other comprehensive income |  |  | (1.1) | (0.6) |
Other comprehensive Income (loss), net |  |  | 15.2 | (0.6) |
Ending Balance |  |  | 19.1 | $ 3.9 | $ 4.5
U.S. Postretirement Plan (“OPEB”) |  |  |  |  |
Accumulated Other Comprehensive income |  |  |  |  |
Plan amendment | $ (26.8) |  | $ 26.8 |  |

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