Postretirement Benefit Plans - Future Benefit Payments (Details) $ in Millions	Dec. 31, 2016 USD ($)
Future pension benefit payments
2016	$ 58.0
2017	62.9
2018	78.8
2019	58.2
2020	69.5
2021-2025	290.9
Gross [Member]
Future pension benefit payments
2016	27.7
2017	26.3
2018	24.7
2019	23.2
2020	21.8
2021-2025	91.4
Expected Medicare Subsidies [Member]
Future pension benefit payments
2016	1.7
2017	1.8
2018	1.8
2019	1.9
2020	1.9
2021-2025	8.6
Net Including Medicare Subsidies [Member]
Future pension benefit payments
2016	26.0
2017	24.5
2018	22.9
2019	21.3
2020	19.9
2021-2025	$ 82.8

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

+ Details

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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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- Definition

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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- Definition

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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