Pensions and Postretirement Benefits (Summary Company's Expected Future Benefit Payments) (Details) $ in Millions	Dec. 31, 2016 USD ($)
Pension Benefits
Other postretirement benefit plans defined benefit net including medicare subsidy
Pension Benefits 2017	$ 4.7
Pension Benefits 2018	4.4
Pension Benefits 2019	4.3
Pension Benefits 2020	4.5
Pension Benefits 2021	4.6
Pension Benefits 2022 to 2026	23.4
Postretirement Benefits
Other postretirement benefit plans defined benefit net including medicare subsidy
Pension Benefits 2017	1.1
Pension Benefits 2018	1.0
Pension Benefits 2019	1.0
Pension Benefits 2020	0.9
Pension Benefits 2021	0.8
Pension Benefits 2022 to 2026	3.5
Postretirement Benefits \| Gross
Other postretirement benefit plans defined benefit net including medicare subsidy
Pension Benefits 2017	1.3
Pension Benefits 2018	1.2
Pension Benefits 2019	1.1
Pension Benefits 2020	1.0
Pension Benefits 2021	0.9
Pension Benefits 2022 to 2026	4.0
Postretirement Benefits \| Expected Medicare Subsidy
Other postretirement benefit plans defined benefit net including medicare subsidy
Pension Benefits 2017	0.2
Pension Benefits 2018	0.2
Pension Benefits 2019	0.1
Pension Benefits 2020	0.1
Pension Benefits 2021	0.1
Pension Benefits 2022 to 2026	$ 0.5

No definition available.

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ 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 (f)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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