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

12 Months Ended

Dec. 31, 2016

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, 2016 and 2015, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value.

	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
Short-term marketable securities	3.0			0.0			0.0			3.0			Marketable securities
Long-term investments	0.4			0.0			0.0			0.4			Other assets
Total	$	444.2		$	0.0		$	0.0		$	444.2
As a percentage of total assets	3.6		%	0.0		%	0.0		%	3.6		%
Liabilities
Contingent acquisition obligations 1	$	0.0		$	0.0		$	205.4		$	205.4
	December 31, 2015												Balance Sheet Classification
	Level 1			Level 2			Level 3			Total
Assets
Cash equivalents	$	875.7		$	0.0		$	0.0		$	875.7		Cash and cash equivalents
Short-term marketable securities	6.8			0.0			0.0			6.8			Marketable securities
Long-term investments	0.4			0.0			0.0			0.4			Other assets
Total	$	882.9		$	0.0		$	0.0		$	882.9
As a percentage of total assets	7.0		%	0.0		%	0.0		%	7.0		%
Liabilities
Contingent acquisition obligations 1	$	0.0		$	0.0		$	143.9		$	143.9

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 increase in this balance of $61.5 from December 31, 2015 to December 31, 2016 is primarily due to acquisitions and exercised put options of $105.8, partially offset by payments of $65.1. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.