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Retirement Plans (Tables) | 6 Months Ended
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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 |

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- Definition Tabular disclosure of defined contribution pension plans or defined contribution other postretirement plans, separately for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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