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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