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Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Debt Outstanding
 
December 31,
 
2017
 
2016
 
(in millions)
Revolving Credit Facility due 2022
$
89.0

 
$
—

6.80% Senior Notes due 2018(1)
—

 
134.0

6.80% Senior Notes due 2020(1)
51.7

 
136.0

6.875% Senior Notes due 2021(1)
397.6

 
625.0

5.375% Senior Notes due 2022
500.0

 
500.0

5.25% Senior Notes due 2023
650.0

 
650.0

5.625% Senior Notes due 2026(1)
500.0

 
—

Less: unamortized discount and unamortized debt issuance costs
(27.5
)
 
(24.1
)
Total long-term debt outstanding
$
2,160.8

 
$
2,020.9