Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Estimated Future Cash Outlays Related to Principal Contractual Obligations

At December 31, 2017, we had other principal contractual obligations, which included agreements to purchase an estimated amount of goods, including raw materials, or services in the normal course of business, aggregating to approximately $67.8 million. The estimated future cash outlays are as follows:

Year	Amount (in millions)
2018(1)	$	62.9
2019	2.5
2020	2.4
Thereafter	—
Total	$	67.8

⁽¹⁾  Contractual obligations in 2018 include an agreement of a one-time $45.0 million payment in lieu of certain future royalty payments to aid in expediting our organizational efficiency initiatives.

Estimated Future Minimum Annual Rental Commitments Under Non-Cancelable Real and Personal Property Leases

At December 31, 2017, estimated future minimum annual rental commitments under non-cancelable real and personal property leases were as follows:

Year	Amount (in millions)
2018	$	10.6
2019	7.9
2020	6.0
2021	3.4
2022	1.3
Thereafter	1.9
Total	$	31.1