Fair Value Measurements Fair Value of Assets and Liabilities Measured on a Recurring Basis (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following tables present information about our financial instruments measured at fair value on a recurring basis as of December 31, 2017 and 2016, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value.

	December 31, 2017								Balance Sheet Classification
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents	$	201.6	$	0.0	$	0.0	$	201.6	Cash and cash equivalents
Liabilities
Contingent acquisition obligations 1	$	0.0	$	0.0	$	147.0	$	147.0
	December 31, 2016								Balance Sheet Classification
	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents	$	440.8	$	0.0	$	0.0	$	440.8	Cash and cash equivalents
Liabilities
Contingent acquisition obligations 1	$	0.0	$	0.0	$	205.4	$	205.4

1 Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional noncontrolling equity shares of consolidated subsidiaries. Fair value measurement of the obligations is based upon actual and projected operating performance targets as specified in the related agreements. The decrease in this balance of $58.4 from December 31, 2016 to December 31, 2017 is primarily due to payments of $105.3, partially offset by acquisitions and exercised put options of $40.8. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.