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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues | $ 1,096.0 | $ 1,067.6 | $ 1,067.7 | $ 1,046.0 | $ 1,008.8 | $ 981.6 | $ 966.4 | $ 957.1 | $ 4,277.3 | $ 3,913.9 | $ 3,642.6
Other operating expenses |  |  |  |  |  |  |  |  | $ 585.1 | 531.6 | 490.6
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  |  | 3,913.9 | 3,642.6
Less: Provision for doubtful accounts |  |  |  |  |  |  |  |  |  | 0.0 | 0.0
Other operating expenses |  |  |  |  |  |  |  |  |  | 531.6 | 488.7
Adjustments for ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  |  | (57.5) | (64.6)
Less: Provision for doubtful accounts |  |  |  |  |  |  |  |  |  | (52.4) | (61.2)
Other operating expenses |  |  |  |  |  |  |  |  |  | (5.1) | (3.4)
As Reported [Member] |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating revenues |  |  |  |  |  |  |  |  |  | 3,971.4 | 3,707.2
Less: Provision for doubtful accounts |  |  |  |  |  |  |  |  |  | 52.4 | 61.2
Other operating expenses |  |  |  |  |  |  |  |  |  | $ 536.7 | $ 492.1

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