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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of defined contribution plan disclosures
Employer contributions for the savings plans were as follows:
(in millions)
 
Three Months Ended
March 31,
 
2017
 
2016
Employer contributions
 
$
4.7

 
$
4.1


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 contribution savings plan were as follows:
(in millions)
 
March 31, 2017
 
December 31, 2016
Common shares held
 
1.2

 
1.2
Components of net periodic benefit cost
The components of net periodic benefit cost were as follows:
 
(in millions)
 
Three Months Ended
March 31,
 
2017
 
2016
Service cost
 
$
0.7

 
$
0.8

Interest cost
 
1.3

 
1.3

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

 
0.6

Net periodic benefit cost
 
$
0.1

 
$
0.2