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Long-term Debt - Textual (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 01, 2019
Sep. 20, 2019
Jun. 07, 2019
May 06, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Debt Instrument [Line Items]                    
Finance lease obligations         $ 363.8 $ 363.8   $ 363.8    
Loss on early extinguishment of debt           0.0 $ 0.0 $ (2.3) $ 0.0  
Document Period End Date               Sep. 30, 2019    
5.75% Senior Notes Due 2024 [Member] | Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Redemption price percentage     101.917%              
Total cash outlay     $ 102.0              
Loss on early extinguishment of debt     $ 2.3              
4.50% Senior Notes due 2028 [Member] | Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Principal amount         500.0 500.0   $ 500.0    
4.75% Senior Notes due 2030 [Member] | Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Principal amount         500.0 $ 500.0   $ 500.0    
4.50% Senior Notes due 2028 and 4.75% Senior Notes due 2030 [Member] | Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Proceeds from Issuance of Debt         983.0          
Proceeds used for payment of equity and vested stock appreciation rights         $ 218.0          
Senior Notes [Member] | 5.75% Senior Notes Due 2024 [Member]                    
Debt Instrument [Line Items]                    
Redemption amount   $ 400.0   $ 100.0            
Adoption of ASC 842 [Member]                    
Debt Instrument [Line Items]                    
Finance lease obligations                   $ 52.0
Subsequent Event [Member] | 5.75% Senior Notes Due 2024 [Member] | Senior Notes [Member]                    
Debt Instrument [Line Items]                    
Redemption price percentage 100.958%                  
Total cash outlay $ 404.0                  
Loss on early extinguishment of debt $ 5.0