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Restructuring Activities - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 7 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2018 USD ($)
Initial Phase |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs incurred |  |  | $ 9.8
Initial Phase | Consulting services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs incurred | $ 3.5 | $ 4.5 |
ITS Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs incurred | 0.5 | 2.3 |
Restructuring, amounts capitalized |  | 10.7 |
Minimum | Initial Phase |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs expected to incur | 8.0 | 8.0 | 8.0
Minimum | Initial Phase | Employee severance and benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs expected to incur | 6.0 | 6.0 | 6.0
Minimum | ITS Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs expected to incur | 40.0 | 40.0 | 40.0
Minimum | ITS Plan | Qualify for capitalization |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs expected to incur | 30.0 | 30.0 | 30.0
Maximum | Initial Phase |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs expected to incur | 10.0 | 10.0 | 10.0
Maximum | Initial Phase | Employee severance and benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs expected to incur | 7.0 | 7.0 | 7.0
Maximum | ITS Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs expected to incur | 50.0 | 50.0 | 50.0
Maximum | ITS Plan | Qualify for capitalization |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Costs expected to incur | $ 35.0 | $ 35.0 | $ 35.0

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