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Fair Value Measurements - Carrying Amounts and Estimated Fair Values by Input Level (Details) - USD ($)
$ in Millions
Jun. 30, 2020
May 31, 2020
Dec. 31, 2019
Jan. 31, 2017
Financial assets:        
Equity securities $ 48.3   $ 40.5  
Financial liabilities:        
Interest rate 5.625%      
Senior Notes | 5.625% Notes        
Financial liabilities:        
Interest rate 5.625%   5.625% 5.625%
Convertible Notes | 2.75% Convertible Notes due 2026        
Financial liabilities:        
Interest rate 2.75% 2.75%    
Recurring | Level 1        
Financial assets:        
Cash and cash equivalents $ 1,244.3   $ 437.4  
Equity 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 | Senior Secured Credit Facilities        
Financial liabilities:        
Long-term debt 2,345.4   1,930.6  
Recurring | Level 1 | Senior Notes | 5.625% Notes        
Financial liabilities:        
Long-term debt 375.3   426.0  
Recurring | Level 1 | Senior Notes | 2.75% Convertible Notes due 2026        
Financial liabilities:        
Long-term debt 497.1      
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 48.3   40.5  
Held-to-maturity securities 6.7   6.7  
Promissory notes 15.3   15.1  
Financial liabilities:        
Other liabilities 2.8   2.8  
Recurring | Level 2 | Senior Secured Credit Facilities        
Financial liabilities:        
Long-term debt 0.0   0.0  
Recurring | Level 2 | Senior Notes | 5.625% Notes        
Financial liabilities:        
Long-term debt 0.0   0.0  
Recurring | Level 2 | Senior Notes | 2.75% Convertible Notes due 2026        
Financial liabilities:        
Long-term debt 0.0      
Recurring | Level 2 | Other long-term obligations        
Financial liabilities:        
Long-term debt 81.1   89.7  
Recurring | Level 3        
Financial assets:        
Cash and cash equivalents 0.0   0.0  
Equity securities 0.0   0.0  
Held-to-maturity securities 0.0   0.0  
Promissory notes 0.0   0.0  
Financial liabilities:        
Other liabilities 7.8   17.5  
Recurring | Level 3 | Senior Secured 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 | 2.75% Convertible Notes due 2026        
Financial liabilities:        
Long-term debt 0.0      
Recurring | Level 3 | Other long-term obligations        
Financial liabilities:        
Long-term debt 0.0   0.0  
Recurring | Carrying Amount        
Financial assets:        
Cash and cash equivalents 1,244.3   437.4  
Equity securities 48.3   40.5  
Held-to-maturity securities 6.7   6.7  
Promissory notes 15.1   15.1  
Financial liabilities:        
Other liabilities 10.6   20.3  
Recurring | Carrying Amount | Senior Secured Credit Facilities        
Financial liabilities:        
Long-term debt 2,403.1   1,896.5  
Recurring | Carrying Amount | Senior Notes | 5.625% Notes        
Financial liabilities:        
Long-term debt 399.4   399.4  
Recurring | Carrying Amount | Senior Notes | 2.75% Convertible Notes due 2026        
Financial liabilities:        
Long-term debt 233.6      
Recurring | Carrying Amount | Other long-term obligations        
Financial liabilities:        
Long-term debt 80.8   89.2  
Recurring | Fair Value        
Financial assets:        
Cash and cash equivalents 1,244.3   437.4  
Equity securities 48.3   40.5  
Held-to-maturity securities 6.7   6.7  
Promissory notes 15.3   15.1  
Financial liabilities:        
Other liabilities 10.6   20.3  
Recurring | Fair Value | Senior Secured Credit Facilities        
Financial liabilities:        
Long-term debt 2,345.4   1,930.6  
Recurring | Fair Value | Senior Notes | 5.625% Notes        
Financial liabilities:        
Long-term debt 375.3   426.0  
Recurring | Fair Value | Senior Notes | 2.75% Convertible Notes due 2026        
Financial liabilities:        
Long-term debt 497.1      
Recurring | Fair Value | Other long-term obligations        
Financial liabilities:        
Long-term debt $ 81.1   $ 89.7