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Retirement Plans | 6 Months Ended
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Jun. 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 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 |
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 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 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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