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Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Market Approach
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Equity securities	$ 61.8	$ 63.5
Debt securities	9.4	12.6
Market Approach | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Equity securities	0.0	0.0
Debt securities	9.4	12.6
Market Approach | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Equity securities	61.8	63.5
Debt securities	0.0	0.0
Market Approach | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Equity securities	0.0	0.0
Debt securities	0.0	0.0
Income Approach
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Redeemable noncontrolling interests	34.0	239.6
Income Approach | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Redeemable noncontrolling interests	0.0	0.0
Income Approach | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Redeemable noncontrolling interests	0.0	0.0
Income Approach | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Redeemable noncontrolling interests	$ 34.0	$ 239.6

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

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The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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