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Fair Value Measurements Fair Value of Assets and Liabilities Measured on a Recurring Basis (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020 and 2019, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value.
 December 31, 2020Balance Sheet Classification
 Level 1Level 2Level 3Total
Assets
Cash equivalents 1
$1,507.4 $0.0 $0.0 $1,507.4 Cash and cash equivalents
Liabilities
Contingent acquisition obligations 2
$0.0 $0.0 $95.5 $95.5 Accrued liabilities and Other non-current liabilities
 December 31, 2019Balance Sheet Classification
 Level 1Level 2Level 3Total
Assets
Cash equivalents 1
$786.0 $0.0 $0.0 $786.0 Cash and cash equivalents
Liabilities
Contingent acquisition obligations 2
$0.0 $0.0 $114.1 $114.1 Accrued liabilities and Other non-current liabilities
1The increase from December 31, 2019 to December 31, 2020 in cash equivalents is related to increased U.S. investments in money market and time deposits driven by higher levels of excess cash near year-end.
2Contingent 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 $18.6 from December 31, 2019 to December 31, 2020 is primarily due to payments. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.