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Restructuring (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Rollforward of all Restructuring Activities
The following is a rollforward of all restructuring activities related to the Company for the year ended December 31, 2017 and 2016:

(in millions)
 
2017
 
2016
Balance at January 1
 
$
14.4

 
$
16.8

Restructuring charges
 
10.8

 
2.5

Use of reserve
 
(6.2
)
 
(4.9
)
Non-cash adjustment (1)
 
(2.9
)
 
—

Balance at December 31
 
$
16.1

 
$
14.4


(1) This non-cash adjustment represents the non-cash stock-based compensation expense recognized during the year ended December 31, 2017 resulting from the accelerated vesting of certain stock options, restricted stock units and performance share units upon the retirement of two executive officers and in connection with the August 2017 RIF.