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Long-term Debt - Long-term Debt Outstanding (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Mar. 31, 2016
Sep. 30, 2015
Mar. 31, 2015
Sep. 11, 2012
Schedule of Outstanding Long-term Debt              
Finance lease obligations $ 384.1            
Finance lease obligations     $ 263.8        
Total debt and Capital lease obligations 3,062.6   2,514.4        
Less: Current portion (39.3)   (35.8)        
Long-term debt, net of current portion 3,023.3   2,478.6        
Term Loan Facilities | Term loan facilities              
Schedule of Outstanding Long-term Debt              
Total debt $ 265.2   $ 280.1        
Senior Notes | 5.125% Senior Notes due 2023              
Schedule of Outstanding Long-term Debt              
Debt instrument interest rate (percent) 5.125%   5.125%     5.125%  
Total debt $ 297.3   $ 296.6        
Senior Notes | 5.75% Senior Notes due 2024              
Schedule of Outstanding Long-term Debt              
Debt instrument interest rate (percent) 5.75%   5.75%       5.75%
Total debt $ 697.3   $ 1,194.7        
Senior Notes | 5.75% Senior Notes due 2025              
Schedule of Outstanding Long-term Debt              
Debt instrument interest rate (percent) 5.75%   5.75% 5.75% 5.75%    
Total debt $ 345.6   $ 345.0        
Senior Notes | 4.50% Senior Notes due 2028              
Schedule of Outstanding Long-term Debt              
Debt instrument interest rate (percent) 4.50% 4.50%          
Total debt $ 491.7   0.0        
Senior Notes | 4.75% Senior Notes due 2030              
Schedule of Outstanding Long-term Debt              
Debt instrument interest rate (percent) 4.75% 4.75%          
Total debt $ 491.7   0.0        
Senior Notes | 2.00% Convertible Senior Subordinated Notes due 2043 [Member]              
Schedule of Outstanding Long-term Debt              
Debt instrument interest rate (percent) 4.75%            
Other Notes Payable              
Schedule of Outstanding Long-term Debt              
Total debt $ 44.7   104.2        
Revolving Credit Facility              
Schedule of Outstanding Long-term Debt              
Total debt $ 45.0   $ 30.0