Debt (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Schedule of Debt Obligations

Our debt obligations consisted of the following as of the periods presented:

	September 30,		December 31,
	2021		2020
	(Dollars in millions)
Term Debt, interest rate of 2.6%	$	659.6	$	664.7
Revolving Credit Facility ($300.0 million available capacity less amounts reserved for    letters of credit, which were $2.3 million and $0.4 million, respectively)		—		—
Convertible Senior Notes, interest rate of 0.25%		575.0		—
Australia Line of Credit (AUD $2.8 million letter of credit capacity as of September 30,   2021, which was fully utilized; USD $2.0 million as of September 30, 2021)		—		—
Canada Line of Credit (CAD $7.0 million letter of credit capacity as of December 31,    2020, which was fully utilized; USD $5.4 million as of December 31, 2020)		—		—
Financing lease liabilities (Please refer to Note 13)		9.9		8.8
Total debt		1,244.5		673.5
Less unamortized discount on Term Debt and Convertible Senior Notes		100.1		1.2
Less unamortized debt issuance costs on Term Debt and Convertible Senior Notes		14.3		4.5
Less current portion of long-term debt		8.3		7.2
Long-term debt, less current portion	$	1,121.8	$	660.6

Schedule of Convertible Senior Notes

The following table presents details of the Notes:

	Initial Conversion Rate per $1,000 Principal	Initial Conversion Price per Share
Notes	7.5641 shares		$132.20

Summary of Interest Expense Recognized Related to Notes

The following table sets forth total interest expense recognized related to the Notes for the period:

	Three Months Ended September 30, 2021		Nine Months Ended September 30, 2021
	(Dollars in millions)
Contractual interest expense	$	0.4	$	0.9
Amortization of debt discount		4.4		9.5
Amortization of debt issuance costs		0.5		1.1
Total	$	5.3	$	11.5

Schedule of Future Principal Payments and Maturities of Indebtedness, Excluding Financing Lease Obligations

The future principal payments and maturities of our indebtedness, excluding financing lease obligations, are as follows:

Years Ending December 31,	Amount
	(Dollars in millions)
Remainder of 2021	$	1.7
2022		6.8
2023		6.8
2024		6.8
2025		637.5
Thereafter		575.0
	$	1,234.6