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Changes in Accumulated Other Comprehensive Income by Component - Summary of Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ 2,605.3	$ 2,517.8	$ 5,075.9	$ 4,945.2
Cost of operations	(1,617.0)	(1,577.2)	(3,123.1)	(3,047.0)
Interest expense	(98.5)	(96.5)	(198.9)	(191.3)
Tax expense	(77.7)	(76.9)	(155.6)	(149.7)
Total gains reclassified into earnings	0.2	0.8	0.3	1.0
Cash Flow Hedge
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Total gains reclassified into earnings			0.3
Amount Reclassified from Accumulated Other Comprehensive Income \| Cash Flow Hedge
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	0.3		0.4
Tax expense	(0.1)		(0.1)
Amount Reclassified from Accumulated Other Comprehensive Income \| Cash Flow Hedge \| Commodity Contract
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Revenue	0.0		0.0
Amount Reclassified from Accumulated Other Comprehensive Income \| Cash Flow Hedge \| Fuel hedges
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Cost of operations	0.0		0.0
Amount Reclassified from Accumulated Other Comprehensive Income \| Cash Flow Hedge \| Terminated interest rate locks
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 0.3		$ 0.4
Amount Reclassified from Accumulated Other Comprehensive Income \| Cash Flow Hedge
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Total before tax		1.1		1.4
Tax expense		(0.3)		(0.4)
Amount Reclassified from Accumulated Other Comprehensive Income \| Cash Flow Hedge \| Commodity Contract
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Revenue		0.3		0.3
Amount Reclassified from Accumulated Other Comprehensive Income \| Cash Flow Hedge \| Fuel hedges
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Cost of operations		1.1		1.9
Amount Reclassified from Accumulated Other Comprehensive Income \| Cash Flow Hedge \| Terminated interest rate locks
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]
Interest expense		$ (0.3)		$ (0.8)