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Restructuring Activities (Tables)
6 Months Ended
Jun. 30, 2018
Restructuring and Related Activities [Abstract]  
Summary of Accrual and Payment Activity
The following table summarizes the accrual and payment activity (in millions):
 
Accrual
Balance, December 31, 2017
$
5.4

Charges and adjustments, net
0.9

Payments
(1.5
)
Balance, June 30, 2018
$
4.8