Presentation of Financial Statements (Details) - USD ($) $ in Millions |
3 Months Ended | ||
---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
Dec. 31, 2017 |
|
Accounting Changes [Line Items] | |||
Revenue | $ 3,629.6 | $ 3,587.4 | |
Operating Expenses | 3,207.9 | 3,171.7 | |
Operating Income (Loss) | 421.7 | 415.7 | |
Interest Expense | 62.3 | 59.3 | |
Accounting Standards Update 2017-07 [Member] | |||
Accounting Changes [Line Items] | |||
Interest Expense | 6.2 | $ 5.8 | |
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member] | |||
Accounting Changes [Line Items] | |||
Cumulative effect adjustment | $ 19.5 | ||
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member] | |||
Accounting Changes [Line Items] | |||
Cumulative effect adjustment | $ 4.1 | ||
Adjustments | |||
Accounting Changes [Line Items] | |||
Revenue | 42.5 | ||
Operating Expenses | 36.0 | ||
Operating Income (Loss) | 6.5 | ||
Amounts without the Adoption of ASC 606 | |||
Accounting Changes [Line Items] | |||
Revenue | 3,672.1 | ||
Operating Expenses | 3,243.9 | ||
Operating Income (Loss) | $ 428.2 |