Fair Value Measurements - Schedule of Carrying Amounts and Estimated Fair Values by Input Level (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024	May 31, 2020
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%
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	$ 591.6	$ 706.6
Equity securities	11.4	10.6
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	0.0
Recurring | Level 1 | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 1 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	0.0	0.0
Recurring | Level 1 | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	0.0	0.0
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	2.7	2.7
Recurring | Level 2 | Amended Credit Facilities
Financial liabilities:
Long-term debt	1,500.9	1,453.9
Recurring | Level 2 | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	392.0	393.0
Recurring | Level 2 | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	357.0	356.0
Recurring | Level 2 | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	340.4	355.7
Recurring | Level 2 | Other long-term obligations
Financial liabilities:
Long-term debt	7.6	8.1
Recurring | Level 3
Financial assets:
Cash and cash equivalents	0.0	0.0
Equity securities	0.0	0.0
Available-for-sale debt securities	31.5	31.5
Held-to-maturity securities	0.0	0.0
Promissory notes	0.0	0.0
Financial liabilities:
Other liabilities	41.9	41.9
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	0.0	201.2
Recurring | Carrying Amount
Financial assets:
Cash and cash equivalents	591.6	706.6
Equity securities	11.4	10.6
Available-for-sale debt securities	31.5	31.5
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	7.9
Financial liabilities:
Other liabilities	44.6	44.6
Recurring | Carrying Amount | Amended Credit Facilities
Financial liabilities:
Long-term debt	1,489.2	1,437.0
Recurring | Carrying Amount | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	399.9	399.8
Recurring | Carrying Amount | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	395.7	395.5
Recurring | Carrying Amount | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	328.3	327.9
Recurring | Carrying Amount | Other long-term obligations
Financial liabilities:
Long-term debt	8.6	210.5
Recurring | Fair Value
Financial assets:
Cash and cash equivalents	591.6	706.6
Equity securities	11.4	10.6
Available-for-sale debt securities	31.5	31.5
Held-to-maturity securities	6.7	6.7
Promissory notes	7.9	7.9
Financial liabilities:
Other liabilities	44.6	44.6
Recurring | Fair Value | Amended Credit Facilities
Financial liabilities:
Long-term debt	1,500.9	1,453.9
Recurring | Fair Value | Senior Notes | 5.625% Notes
Financial liabilities:
Long-term debt	392.0	393.0
Recurring | Fair Value | Senior Notes | 4.125% Notes due 2029
Financial liabilities:
Long-term debt	357.0	356.0
Recurring | Fair Value | Convertible Notes | Convertible Notes
Financial liabilities:
Long-term debt	340.4	355.7
Recurring | Fair Value | Other long-term obligations
Financial liabilities:
Long-term debt	$ 7.6	$ 209.3