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Schedule of Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | $ 123.5 | $ 123.5
Accumulated intangible asset amortization | (48.6) | (47.5)
Amortizable intangible assets, net | $ 74.9 | 76.0
Average useful life of finite-lived intangible assets | 15 years |
Contract-Based Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | $ 54.6 | 54.6
Accumulated intangible asset amortization | (28.0) | (28.0)
Amortizable intangible assets, net | 26.6 | 26.6
Customer-Related Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 68.9 | 68.9
Accumulated intangible asset amortization | (20.6) | (19.5)
Amortizable intangible assets, net | $ 48.3 | $ 49.4

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