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Long-Term Debt 4 1/8 Senior Notes (Details) - USD ($)
12 Months Ended
Feb. 26, 2020
Nov. 12, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Proceeds from issuance of long-term debt     $ 400,000,000 $ 0 $ 1,789,200,000
Four and One Eighth Percent Senior Notes Due 2028 [Member]          
Validity Tender Offer Percentage   90.00%      
Proceeds from issuance of long-term debt   $ 394,700,000      
Debt Instrument, Face Amount   $ 400,000,000      
Redemption Price Percent If Change In Control Occurs in Addition to Accrued and Unpaid Interest   101.00%      
Senior Notes [Member] | Four and One Eighth Percent Senior Notes Due 2028 [Member]          
Debt Instrument Offering Price Percentage at Principle Amount   100.00%      
Debt Instrument Redemption Period - Post October 1 2022 [Member] | Four and One Eighth Percent Senior Notes Due 2028 [Member]          
Debt Instrument, Redemption Price, Percentage, Initial, Plus Accrued and Unpaid Interest   102.063%      
Debt Instrument Redemption Period - Post October 1 2024 [Member] | Four and One Eighth Percent Senior Notes Due 2028 [Member]          
Debt Instrument, Redemption Price, Percentage, Ending, Plus Accrued and Unpaid Interest   100.00%      
Debt Instrument, Redemption - Pre October 1 2022 [Member] | Four and One Eighth Percent Senior Notes Due 2028 [Member]          
Debt Instrument, Redemption Price, Percentage Plus a Make-Whole Premium   100.00%      
Maximum Redemption Percent Allowed And Limited To Proceeds From Equity Offering   35.00%      
Debt Redemption, Price Percent Of Principal Amount, From the Proceeds of Certain Equity Offerings plus accrued and unpaid interest   104.125%      
Subsequent Event [Member] | Four and One Eighth Percent Senior Notes Due 2028 [Member]          
Proceeds from issuance of long-term debt $ 196,500,000        
Debt Instrument, Face Amount $ 200,000,000        
Subsequent Event [Member] | Senior Notes [Member] | Four and One Eighth Percent Senior Notes Due 2028 [Member]          
Debt Instrument Offering Price Percentage 99.50%