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Debt - Narrative (Details) - USD ($)
12 Months Ended
Apr. 03, 2018
Sep. 16, 2014
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]          
Debt Instrument, Event of Default, Percent Principal Aggregate Outstanding   25.00%      
Final Judgment for Payment, Event of Debt Default   $ 75,000,000      
Debt Instrument, Required Redemption Price, Percentage   101.00%      
Debt Instrument, Redemption Price, Percentage   100.00%      
Debt Instrument, Price as Percent of Par Value   100.00%      
Repayments of Debt     $ 24,200,000 $ 587,800,000 $ 143,900,000
Loss on early extinguishment of debt     $ 0 4,800,000 $ 0
Defined Benefit Plan, Plan Assets, Contributions by Employer       $ 50,000,000.0  
Senior Notes, Due 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage   5.625% 5.625% 5.625%  
Debt Instrument, Face Amount   $ 300,000,000      
Senior Notes, Due 2021 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage   5.125% 5.125% 5.125%  
Debt Instrument, Face Amount   $ 700,000,000      
Senior Notes [Member]          
Debt Instrument [Line Items]          
Senior Notes   $ 1,000,000,000.0      
Debt Instrument, Basis Spread on Variable Rate   50.00%      
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate 175.00%        
Debt Instrument, Face Amount $ 400,000,000        
2025 Term Loan [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Periodic Payment $ 9,500,000        
Debt Instrument, Basis Spread on Variable Rate 175.00%        
Debt Instrument, Face Amount $ 950,000,000        
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Current Borrowing Capacity     $ 378,500,000    
Long-term Line of Credit     $ 0