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Contingent Acquisition Obligations (Details) $ in Millions	Dec. 31, 2019 USD ($)
Deferred acquisition payments
Business Acquisition, Contingent Consideration [Line Items]
Future contingent acquisition obligation due in 2018	$ 45.7
Future contingent acquisition obligation due in 2019	30.4
Future contingent acquisition obligation due in 2020	7.4
Future contingent acquisition obligation due in 2021	4.4
Future contingent acquisition obligation due in 2022	2.4
Future contingent acquisition obligation due thereafter	0.0
Future contingent acquisition obligation due, total	90.3
Redeemable noncontrolling interests and call options with affiliates
Business Acquisition, Contingent Consideration [Line Items]
Future contingent acquisition obligation due in 2018	26.2
Future contingent acquisition obligation due in 2019	37.9
Future contingent acquisition obligation due in 2020	32.4
Future contingent acquisition obligation due in 2021	6.2
Future contingent acquisition obligation due in 2022	2.5
Future contingent acquisition obligation due thereafter	0.2
Future contingent acquisition obligation due, total	105.4
Redeemable at noncontrolling equity owners discretion
Business Acquisition, Contingent Consideration [Line Items]
Future contingent acquisition obligation due in 2018	21.5
Total contingent acquisition payments
Business Acquisition, Contingent Consideration [Line Items]
Future contingent acquisition obligation due in 2018	71.9
Future contingent acquisition obligation due in 2019	68.3
Future contingent acquisition obligation due in 2020	39.8
Future contingent acquisition obligation due in 2021	10.6
Future contingent acquisition obligation due in 2022	4.9
Future contingent acquisition obligation due thereafter	0.2
Future contingent acquisition obligation due, total	$ 195.7

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Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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Amount of the recorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the recorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the recorded unconditional purchase obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the recorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the recorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the recorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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