Fair Value Measurements - Schedule of Carrying Amounts and Estimated Fair Values by Input Level (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Jul. 01, 2021	May 31, 2020
Financial assets:
Equity securities	$ 8.2	$ 10.7
Senior Notes | 5.625% Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	5.625%	5.625%
Senior Notes | 4.125% Notes due 2029
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	4.125%	4.125%	4.125%
Convertible Notes
Financial liabilities:
Long-term debt	$ 24.2	$ 24.2
Convertible Notes | Convertible Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	2.75%			2.75%
Recurring | Level 1
Financial assets:
Cash and cash equivalents	$ 834.0	1,071.8
Equity securities	8.2	10.7
Available-for-sale debt securities	0.0	0.0
Held-to-maturity securities	0.0	0.0
Promissory notes	0.0	0.0
Financial liabilities:
Other liabilities	0.0	0.0
Recurring | Level 1 | Amended Credit Facilities
Financial liabilities:
Long-term debt	0.0	1,483.5
Recurring | Level 1 | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	0.0	388.0
Recurring | Level 1 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	0.0	340.0
Recurring | Level 1 | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	0.0	427.6
Recurring | Level 1 | Other long-term obligations
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 2
Financial assets:
Cash and cash equivalents	0.0	0.0
Equity securities	0.0	0.0
Available-for-sale debt securities	0.0	0.0
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	7.9
Financial liabilities:
Other liabilities	2.6	2.7
Recurring | Level 2 | Amended Credit Facilities
Financial liabilities:
Long-term debt	1,459.5	0.0
Recurring | Level 2 | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	394.0	0.0
Recurring | Level 2 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	364.0	0.0
Recurring | Level 2 | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	356.9	0.0
Recurring | Level 2 | Other long-term obligations
Financial liabilities:
Long-term debt	8.1	18.0
Recurring | Level 3
Financial assets:
Cash and cash equivalents	0.0	0.0
Equity securities	0.0	0.0
Available-for-sale debt securities	24.2	24.2
Held-to-maturity securities	0.0	0.0
Promissory notes	0.0	0.0
Financial liabilities:
Other liabilities	42.0	76.2
Recurring | Level 3 | Amended Credit Facilities
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 3 | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 3 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 3 | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 3 | Other long-term obligations
Financial liabilities:
Long-term debt	188.2	154.1
Recurring | Carrying Amount
Financial assets:
Cash and cash equivalents	834.0	1,071.8
Equity securities	8.2	10.7
Available-for-sale debt securities	24.2	24.2
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	7.9
Financial liabilities:
Other liabilities	44.7	79.0
Recurring | Carrying Amount | Amended Credit Facilities
Financial liabilities:
Long-term debt	1,445.4	1,471.7
Recurring | Carrying Amount | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	399.8	399.7
Recurring | Carrying Amount | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	395.3	394.6
Recurring | Carrying Amount | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	327.4	326.1
Recurring | Carrying Amount | Other long-term obligations
Financial liabilities:
Long-term debt	197.5	173.5
Recurring | Fair Value
Financial assets:
Cash and cash equivalents	834.0	1,071.8
Equity securities	8.2	10.7
Available-for-sale debt securities	24.2	24.2
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	7.9
Financial liabilities:
Other liabilities	44.6	78.9
Recurring | Fair Value | Amended Credit Facilities
Financial liabilities:
Long-term debt	1,459.5	1,483.5
Recurring | Fair Value | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	394.0	388.0
Recurring | Fair Value | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	364.0	340.0
Recurring | Fair Value | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	356.9	427.6
Recurring | Fair Value | Other long-term obligations
Financial liabilities:
Long-term debt	$ 196.3	$ 172.1