Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of carrying amount and fair value of financial instruments

As of December 31, 2018 and 2017, our assets and liabilities that are measured at fair value on a recurring basis include the following:

	December 31, 2018
			Fair Value
	Carrying Amount		Total		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market mutual funds	$	37.1	$	37.1	$	37.1	$	—	$	—
Bonds - restricted cash and marketable securities and other assets	47.8		47.8		—		47.8		—
Interest rate swaps - other assets	2.5		2.5		—		2.5		—
Interest rate locks - other assets	10.3		10.3		—		10.3		—
Total assets	$	97.7	$	97.7	$	37.1	$	60.6	$	—
Liabilities:
Contingent consideration - other long-term liabilities	$	70.9	$	70.9	$	—	$	—	$	70.9
Total liabilities	$	70.9	$	70.9	$	—	$	—	$	70.9

 

	December 31, 2017
			Fair Value
	Carrying Amount		Total		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Money market mutual funds	$	30.3	$	30.3	$	30.3	$	—	$	—
Bonds - restricted cash and marketable securities and other assets	92.1		92.1		—		92.1		—
Fuel hedges - other current assets	3.0		3.0		—		3.0		—
Interest rate swaps - other assets	8.0		8.0		—		8.0		—
Interest rate locks - other assets	19.1		19.1		—		19.1		—
Total assets	$	152.5	$	152.5	$	30.3	$	122.2	$	—
Liabilities:
Commodity hedges - other accrued liabilities	$	0.2	$	0.2	$	—	$	0.2	$	—
Contingent consideration - other long-term liabilities	73.3		73.3		—		—		73.3
Total liabilities	$	73.5	$	73.5	$	—	$	0.2	$	73.3