Changes in Accumulated Other Comprehensive Loss (Income) by Component - Summary of Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Cost of operations	$ (1,476.7)	$ (1,390.2)	$ (4,298.7)	$ (4,114.9)
Interest expense	(96.3)	(91.8)	(281.3)	(272.0)
Total before tax	126.9	350.8	671.2	934.0
Tax benefit	(41.2)	(135.6)	(247.6)	(356.0)
Net of tax	85.7	215.2	423.6	578.0
Reclassification out of Accumulated Other Comprehensive Income
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	(9.5)	(5.0)	(21.6)	(12.9)
Reclassification out of Accumulated Other Comprehensive Income \| Gains (Losses) on Cash Flow Hedges
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(15.8)	(8.2)	(35.8)	(21.4)
Tax benefit	6.3	3.2	14.2	8.5
Reclassification out of Accumulated Other Comprehensive Income \| Gains (Losses) on Cash Flow Hedges \| Fuel hedges
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Cost of operations	(8.0)	(7.5)	(26.7)	(19.4)
Reclassification out of Accumulated Other Comprehensive Income \| Gains (Losses) on Cash Flow Hedges \| Terminated interest rate locks
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (7.8)	$ (0.7)	$ (9.1)	$ (2.0)

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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