Pension and Other Post-Retirement Benefit Plans (Pension Plan Assets Measured At Fair Value) (Details) - Pensions - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total pension plan assets, percent		98.80%
U.S.
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		$ 477.4	$ 576.4
U.S. | Fair value, measurements, recurring
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		477.4	576.2
U.S. | Fair value, measurements, recurring | Cash and cash equivalents
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		46.8	41.2
U.S. | Fair value, measurements, recurring | U.S. companies
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		109.4	131.7
U.S. | Fair value, measurements, recurring | International companies
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		8.5	33.7
U.S. | Fair value, measurements, recurring | Registered investment companies
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets	[1]	32.6	33.6
U.S. | Fair value, measurements, recurring | Common/collective trusts
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets	[1]	11.7	31.2
U.S. | Fair value, measurements, recurring | Hedge funds
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets	[1]	176.5	194.3
U.S. | Fair value, measurements, recurring | Limited partnerships
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets	[1]	89.7	109.7
U.S. | Fair value, measurements, recurring | Real estate and other investments
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		2.2	0.8
U.S. | Fair value, measurements, recurring | Level 1
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		166.9	207.4
U.S. | Fair value, measurements, recurring | Level 1 | Cash and cash equivalents
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		46.8	41.2
U.S. | Fair value, measurements, recurring | Level 1 | U.S. companies
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		109.4	131.7
U.S. | Fair value, measurements, recurring | Level 1 | International companies
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		8.5	33.7
U.S. | Fair value, measurements, recurring | Level 1 | Real estate and other investments
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		2.2	0.8
International
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		570.6	699.2	$ 229.7
International | Fair value, measurements, recurring
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		569.8	698.4
International | Fair value, measurements, recurring | Cash and cash equivalents
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		11.1	4.8
International | Fair value, measurements, recurring | U.S. companies
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		92.2	106.9
International | Fair value, measurements, recurring | International companies
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		186.8	216.7
International | Fair value, measurements, recurring | Registered investment companies
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets	[1]	44.4	72.6
International | Fair value, measurements, recurring | Common/collective trusts
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets	[1]	10.0	13.0
International | Fair value, measurements, recurring | Insurance contracts
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		125.0	208.2
International | Fair value, measurements, recurring | Hedge funds
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets	[1]	99.1	74.7
International | Fair value, measurements, recurring | Real estate and other investments
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		1.2	1.5
International | Fair value, measurements, recurring | Level 1
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		291.3	329.9
International | Fair value, measurements, recurring | Level 1 | Cash and cash equivalents
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		11.1	4.8
International | Fair value, measurements, recurring | Level 1 | U.S. companies
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		92.2	106.9
International | Fair value, measurements, recurring | Level 1 | International companies
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		186.8	216.7
International | Fair value, measurements, recurring | Level 1 | Real estate and other investments
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		1.2	1.5
International | Fair value, measurements, recurring | Level 2
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		125.0	208.2
International | Fair value, measurements, recurring | Level 2 | Insurance contracts
Pension and Other Postretirement Benefit Plans Disclosure [Line Items]
Total plan assets		$ 125.0	$ 208.2

[1] Certain investments that are measured at fair value using net asset value per share (or its equivalent) have not been classified in the fair value hierarchy.