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Debt (Narrative) (Details)
3 Months Ended 9 Months Ended
Oct. 07, 2020
USD ($)
Nov. 15, 2019
USD ($)
tradingDay
Jun. 27, 2017
USD ($)
Jun. 10, 2014
USD ($)
tradingDay
Sep. 30, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
tradingDay
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
$ / shares
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]                  
Fair value of debt instruments         $ 1,600,000,000 $ 1,800,000,000   $ 1,600,000,000  
Deferred issuance costs         12,453,000 14,058,000   12,453,000  
Senior Notes | 6.0% Senior Notes                  
Debt Instrument [Line Items]                  
Face amount     $ 650,000,000            
Stated interest rate     6.00%            
Covenant, leverage ratio, minimum     3.0            
Restricted payments for senior notes     $ 75,000,000            
Proceeds from debt, net of issuance costs     $ 636,500,000            
Fair value of debt instruments         $ 676,200,000 $ 689,800,000   $ 676,200,000  
Senior Notes | 6.0% Senior Notes | Subsequent Event                  
Debt Instrument [Line Items]                  
Restricted payments for senior notes $ 694,600,000                
Senior Notes | 4.625% Senior Notes | Subsequent Event                  
Debt Instrument [Line Items]                  
Face amount $ 750,000,000                
Stated interest rate 4.625%                
Convertible Debt | 3.25% Convertible Notes                  
Debt Instrument [Line Items]                  
Face amount       $ 402,500,000          
Stated interest rate       3.25%          
Debt maturity date               Jun. 15, 2029  
Contingent interest, minimum trading price per principal amount       $ 1,300          
Convertible debt threshold trading days | tradingDay           20      
Convertible debt conversion ratio           1.30   0.0147632  
Convertible debt conversion price (in usd per share) | $ / shares         $ 67.74     $ 67.74  
Redemption price, percentage       100.00%          
Borrowing rates of similar debt without the conversion feature       5.79%          
Unamortized discount       $ 59,000,000.0          
Effective interest rate       5.81%          
Convertible debt carrying amount of equity component       $ 37,700,000          
Convertible debt remaining discount amortization period               8 months 12 days  
Fair value of debt instruments         $ 461,000,000.0 $ 583,600,000   $ 461,000,000.0  
Convertible Debt | 3.25% Convertible Notes | Debt Instrument, Redemption, Period One                  
Debt Instrument [Line Items]                  
Convertible debt threshold trading days | tradingDay       20          
Convertible debt threshold consecutive trading days | tradingDay       30          
Convertible debt conversion ratio       1.30          
Convertible Debt | 3.25% Convertible Notes | Debt Instrument, Redemption, Period Two                  
Debt Instrument [Line Items]                  
Convertible debt threshold consecutive trading days | tradingDay       10          
Convertible debt conversion ratio       0.98          
Convertible debt threshold consecutive business days | tradingDay       5          
Convertible Debt | 1.75% Convertible Notes                  
Debt Instrument [Line Items]                  
Face amount   $ 550,000,000.0              
Stated interest rate   1.75%              
Debt maturity date   Nov. 01, 2026              
Convertible debt conversion ratio               0.0079864  
Convertible debt conversion price (in usd per share) | $ / shares         $ 125.21     $ 125.21  
Borrowing rates of similar debt without the conversion feature   5.50%              
Unamortized discount   $ 118,900,000              
Effective interest rate   5.50%              
Convertible debt carrying amount of equity component   $ 88,100,000              
Convertible debt remaining discount amortization period               6 years 1 month 6 days  
Proceeds from debt, net of issuance costs   537,100,000              
Unamortized debt issuance expense         $ 9,200,000     $ 9,200,000  
Fair value of debt instruments         490,200,000 $ 559,600,000   490,200,000  
Gross debt issuance costs   12,900,000              
Accumulated amortization of debt issuance costs   10,100,000              
Deferred issuance costs   $ 2,800,000              
Convertible Debt | 1.75% Convertible Notes | Debt Instrument, Redemption, Period One                  
Debt Instrument [Line Items]                  
Convertible debt threshold trading days | tradingDay   20              
Convertible debt threshold consecutive trading days | tradingDay   30              
Convertible debt conversion ratio   1.30              
Convertible Debt | 1.75% Convertible Notes | Debt Instrument, Redemption, Period Two                  
Debt Instrument [Line Items]                  
Convertible debt threshold trading days | tradingDay   5              
Convertible debt threshold consecutive trading days | tradingDay   10              
Convertible debt conversion ratio   0.98              
Line of Credit                  
Debt Instrument [Line Items]                  
Line of credit, debt issuance costs before accumulated amortization         400,000     400,000  
Line of credit, debt issuance costs after accumulated amortization         200,000     200,000  
Interest expense         $ 0   $ 1,100,000 $ 0 $ 2,300,000