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Debt (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Debt Outstanding
 
December 31,
 
2016
 
2015
 
(in millions)
Revolving Credit Facility due 2019
$
—

 
$
—

6.05% Senior Notes due 2016(1)
—

 
176.8

6.80% Senior Notes due 2018
134.0

 
134.0

6.80% Senior Notes due 2020
136.0

 
136.0

6.875% Senior Notes due 2021
625.0

 
625.0

5.375% Senior Notes due 2022
500.0

 
500.0

5.25% Senior Notes due 2023
650.0

 
650.0

Less: unamortized discount and unamortized debt issuance costs
(24.1
)
 
(30.3
)
Total principal amount of debt (including current portion)
2,020.9

 
2,191.5

Less: current portion of long-term debt
—

 
(176.8
)
Total long-term debt outstanding
$
2,020.9

 
$
2,014.7