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Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
 
Fair Value (1)
(in millions)December 31,
2019		December 31,
2018		December 31,
2019		December 31,
2018
3.75% Notes due 2027$600.0  $600.0  $623.4  $579.4  
3.5% Notes due 2024400.0  400.0  414.2  386.4  
3.75% Notes due 2022350.0  350.0  361.4  345.5  
5.125% Notes due 2020250.0  250.0  255.0  255.0  
Unamortized discount, debt issuance costs and other(8.4) (12.2) 
Total long term-debt$1,591.6  $1,587.8    
Less current portion of long-term debt250.2  —    
Total long term-debt, net of current portion$1,341.4  $1,587.8    
(1)The fair value is estimated based on current yield rates plus the Company’s estimated credit spread available for financings with similar terms and maturities. Based on these inputs, debt instruments are classified as Level 2 in the fair value hierarchy.
Debt Instrument Redemption The Notes may also be redeemed at any time after the dates noted below, in whole or in part, at the Company's option at 100.0% of the principal amount, plus accrued and unpaid interest.
Debt InstrumentDateSpread
3.75% Notes due 2027September 1, 202725 basis points  
3.5% Notes due 2024October 1, 202420 basis points  
3.75% Notes due 2022August 15, 202235 basis points  
5.125% Notes due 2020September 15, 202035 basis points