Accounts Payable and Accrued Expenses (Tables)

6 Months Ended

Jun. 30, 2018

Payables And Accruals [Abstract]

Schedule of accounts payable and accrued expenses

Accounts payable and accrued expenses at June 30, 2018 and December 31, 2017 are summarized as follows:

($ in millions)	June 30, 2018		December 31, 2017
Trade accounts payable	$	264.6	$	204.9
Employee-related expenses		48.1		59.7
Accrued vacation		25.0		23.8
Miscellaneous accrued expenses		95.3		87.4
Total	$	433.0	$	375.8