Postretirement Benefit Plans - Future Benefit Payments (Details) $ in Millions	Dec. 31, 2015 USD ($)
Future pension benefit payments
2016	$ 94.5
2017	67.4
2018	59.5
2019	83.8
2020	63.2
2021-2025	331.6
Gross [Member]
Future pension benefit payments
2016	29.0
2017	27.7
2018	26.5
2019	25.1
2020	23.7
2021-2025	101.4
Expected Medicare Subsidies [Member]
Future pension benefit payments
2016	1.7
2017	1.7
2018	1.7
2019	1.7
2020	1.7
2021-2025	7.8
Net Including Medicare Subsidies [Member]
Future pension benefit payments
2016	27.3
2017	26.0
2018	24.8
2019	23.4
2020	22.0
2021-2025	$ 93.6

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=58740216&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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