Pensions (Schedule of Pension Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
U.S.
Defined benefit plan, fair value of pension plan assets	$ 326.5	$ 333.0
Non-US
Defined benefit plan, fair value of pension plan assets	449.4	463.9
Quoted prices in active markets for identical assets (Level 1) | U.S.
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Quoted prices in active markets for identical assets (Level 1) | Non-US
Defined benefit plan, fair value of pension plan assets	0.3	1.6
Significant other observable inputs (Level 2) | U.S.
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Significant other observable inputs (Level 2) | Non-US
Defined benefit plan, fair value of pension plan assets	6.6	7.3
Significant unobservable inputs (Level 3) | U.S.
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Significant unobservable inputs (Level 3) | Non-US
Defined benefit plan, fair value of pension plan assets	3.8	4.2
Assets valued using NAV | U.S.
Defined benefit plan, fair value of pension plan assets	326.5	333.0
Assets valued using NAV | Non-US
Defined benefit plan, fair value of pension plan assets	438.7	450.8
Cash, cash equivalents and short-term investments | U.S.
Defined benefit plan, fair value of pension plan assets	4.5	2.1
Cash, cash equivalents and short-term investments | Non-US
Defined benefit plan, fair value of pension plan assets	104.2	94.1
Cash, cash equivalents and short-term investments | Quoted prices in active markets for identical assets (Level 1) | U.S.
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Cash, cash equivalents and short-term investments | Quoted prices in active markets for identical assets (Level 1) | Non-US
Defined benefit plan, fair value of pension plan assets	0.3	1.6
Cash, cash equivalents and short-term investments | Significant other observable inputs (Level 2) | U.S.
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Cash, cash equivalents and short-term investments | Significant other observable inputs (Level 2) | Non-US
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Cash, cash equivalents and short-term investments | Significant unobservable inputs (Level 3) | U.S.
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Cash, cash equivalents and short-term investments | Significant unobservable inputs (Level 3) | Non-US
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Cash, cash equivalents and short-term investments | Assets valued using NAV | U.S.
Defined benefit plan, fair value of pension plan assets	4.5	2.1
Cash, cash equivalents and short-term investments | Assets valued using NAV | Non-US
Defined benefit plan, fair value of pension plan assets	103.9	92.5
Common collective trusts | U.S.
Defined benefit plan, fair value of pension plan assets	252.3	288.4
Common collective trusts | Quoted prices in active markets for identical assets (Level 1) | U.S.
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Common collective trusts | Significant other observable inputs (Level 2) | U.S.
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Common collective trusts | Significant unobservable inputs (Level 3) | U.S.
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Common collective trusts | Assets valued using NAV | U.S.
Defined benefit plan, fair value of pension plan assets	252.3	288.4
Equity mutual funds | Non-US
Defined benefit plan, fair value of pension plan assets	115.6	113.3
Equity mutual funds | Quoted prices in active markets for identical assets (Level 1) | Non-US
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Equity mutual funds | Significant other observable inputs (Level 2) | Non-US
Defined benefit plan, fair value of pension plan assets	3.1	3.3
Equity mutual funds | Significant unobservable inputs (Level 3) | Non-US
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Equity mutual funds | Assets valued using NAV | Non-US
Defined benefit plan, fair value of pension plan assets	112.5	110.0
Corporate and Non-U.S. Bonds | Non-US
Defined benefit plan, fair value of pension plan assets	169.4	207.3
Corporate and Non-U.S. Bonds | Quoted prices in active markets for identical assets (Level 1) | Non-US
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Corporate and Non-U.S. Bonds | Significant other observable inputs (Level 2) | Non-US
Defined benefit plan, fair value of pension plan assets	3.0	3.5
Corporate and Non-U.S. Bonds | Significant unobservable inputs (Level 3) | Non-US
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Corporate and Non-U.S. Bonds | Assets valued using NAV | Non-US
Defined benefit plan, fair value of pension plan assets	166.4	203.8
Other investments | U.S.
Defined benefit plan, fair value of pension plan assets	69.7	42.5
Other investments | Non-US
Defined benefit plan, fair value of pension plan assets	60.2	49.2
Other investments | Quoted prices in active markets for identical assets (Level 1) | U.S.
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Other investments | Quoted prices in active markets for identical assets (Level 1) | Non-US
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Other investments | Significant other observable inputs (Level 2) | U.S.
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Other investments | Significant other observable inputs (Level 2) | Non-US
Defined benefit plan, fair value of pension plan assets	0.5	0.5
Other investments | Significant unobservable inputs (Level 3) | U.S.
Defined benefit plan, fair value of pension plan assets	0.0	0.0
Other investments | Significant unobservable inputs (Level 3) | Non-US
Defined benefit plan, fair value of pension plan assets	3.8	4.2
Other investments | Assets valued using NAV | U.S.
Defined benefit plan, fair value of pension plan assets	69.7	42.5
Other investments | Assets valued using NAV | Non-US
Defined benefit plan, fair value of pension plan assets	$ 55.9	$ 44.5