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Debt - Schedule of Interest Expense (Details) - Senior Notes - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
2022 Notes        
Debt Instrument [Line Items]        
Contractual interest coupon $ 11.9 $ 11.9 $ 35.5 $ 35.5
Amortization of debt issuance costs 0.6 0.6 1.8 1.8
Total 12.5 12.5 37.3 37.3
5.50% convertible senior notes due 2021        
Debt Instrument [Line Items]        
Contractual interest coupon 1.8 2.9 7.7 8.8
Amortization of debt discount 1.2 1.7 4.7 4.9
Amortization of debt issuance costs 0.2 0.3 0.8 0.9
Total $ 3.2 $ 4.9 $ 13.2 $ 14.6