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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Components of net periodic benefit cost The components of net periodic benefit cost were as follows: 
(in millions)
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
0.6

 
$
0.9

 
$
1.3

 
$
1.7

Interest cost
 
1.3

 
1.4

 
2.6

 
2.7

Expected return on plan assets
 
(2.6
)
 
(2.6
)
 
(5.1
)
 
(5.1
)
Amortization of unrecognized loss
 
0.7

 
0.6

 
1.3

 
1.2

Net periodic benefit cost
 
$
—

 
$
0.3

 
$
0.1

 
$
0.5
Schedule of defined contribution plan disclosures Employer contributions for the savings plans were as follows:
(in millions)
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Employer contributions
 
$
3.5

 
$
3.1

 
$
8.2

 
$
7.2


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 contribution savings plan were as follows:
(in millions)
 
June 30, 2017
 
December 31, 2016
Common shares held
 
1.2

 
1.2