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Retirement Plans
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Retirement Plans Retirement Plans
 
Defined Benefit Plans
 
The Company recognizes net periodic benefit cost based on the actuarial analysis performed at the previous year end, adjusted if certain significant events occur during the year. 
 
The components of net periodic benefit cost were as follows:
 
(in millions)
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
0.7

 
$
0.8

 
$
2.0

 
$
2.5

Interest cost
 
1.3

 
1.3

 
3.9

 
4.0

Expected return on plan assets
 
(2.5
)
 
(2.5
)
 
(7.6
)
 
(7.6
)
Amortization of unrecognized loss
 
0.6

 
0.6

 
1.9

 
1.8

Net periodic benefit cost
 
$
0.1

 
$
0.2

 
$
0.2

 
$
0.7


 
Defined Contribution Plans
 
The Company maintains defined contribution savings plans covering a significant portion of its eligible employees. Participant contributions are matched by the Company up to a 4.0% maximum of eligible compensation, subject to compensation and contribution limits as defined by the Internal Revenue Service. Employer contributions for the savings plans were as follows:
(in millions)
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Employer contributions
 
$
3.3

 
$
3.0

 
$
11.5

 
$
10.2


Matching contributions are invested in funds as directed by participants. Eligible participants may also elect to invest up to 50.0% of the Company's matching contribution in Company common stock. Common shares held by the defined contribution savings plan were as follows:
(in millions)
 
September 30, 2017
 
December 31, 2016
Common shares held
 
1.2

 
1.2