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v3.19.1

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 |

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