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Segment Information (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
customer
Mar. 31, 2018
USD ($)
customer
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2019
USD ($)
customer
Mar. 31, 2018
USD ($)
customer
Mar. 31, 2017
USD ($)
customer
Concentration Risk [Line Items]                          
Revenues     $ 913.7 $ 933.2 $ 901.0 $ 932.7 $ 1,040.2 $ 1,142.7 $ 940.8 $ 1,005.3 $ 3,680.5 $ 4,129.1 $ 3,201.5
Customer Concentration Risk | Sales Revenue, Net                          
Concentration Risk [Line Items]                          
Number of customers over 10% threshold | customer                     1 1 0
Revenues                     $ 401.9 $ 413.2  
Customer Concentration Risk | Accounts Receivable                          
Concentration Risk [Line Items]                          
Number of customers over 10% threshold | customer 2 1                      
Percentage of consolidated gross accounts receivable attributable to customer over threshold 31.00% 32.00%                      
Accounts receivable, gross $ 269.9 $ 419.2 $ 269.9       $ 419.2       $ 269.9 $ 419.2