Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Financial Assets And Liabilities Measured At Fair Value

The following table presents information about our financial instruments measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 using the inputs and fair value hierarchy discussed in Note 2, "Summary of Significant Accounting Policies and Recent Accounting Pronouncements":

Financial Instruments Measured at Fair Value on a Recurring Basis

	March 31, 2018								December 31, 2017
(in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Other Assets
Deferred compensation plan investments (1)	$	119.0	$	—	$	—	$	119.0	$	120.3	$	—	$	—	$	120.3
Derivative financial instruments - forward interest rate swap	—		7.7		—		7.7		—		2.2		—		2.2
Other Liabilities
Derivative financial instruments - forward interest rate swaps	$	—	$	2.4	$	—	$	2.4	$	—	$	0.5	$	—	$	0.5

(1) Approximately $3.0 million and $4.2 million of participant cash was withdrawn from our deferred compensation plan investments during the three months ended March 31, 2018 and the year ended December 31, 2017, respectively. Approximately $23.2 million of shares in the compensation plan were diversified into the deferred compensation plan investments during the year ended December 31, 2017.

Fair Value Of Notes Payable

The following table presents the carrying and estimated fair values of our notes payable at March 31, 2018 and December 31, 2017, in accordance with the policies discussed in Note 2, "Summary of Significant Accounting Policies and Recent Accounting Pronouncements."

	March 31, 2018				December 31, 2017
(in millions)	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Fixed rate notes payable	$	2,029.9	$	2,069.8	$	2,029.6	$	2,106.5
Floating rate notes payable	175.0		174.2		175.0		173.7