Financial Instruments and Fair Value Measurements - Schedule of Long-term Debt Carrying Value and Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
5.00% Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percentage)	5.00%
Carrying Value
Debt Instrument [Line Items]
Debt, fair value	$ 636.9	$ 587.1
Carrying Value | 5.00% Senior Notes
Debt Instrument [Line Items]
Debt, fair value	547.1	546.4
Carrying Value | Real estate related
Debt Instrument [Line Items]
Debt, fair value	89.8	40.7
Fair Value
Debt Instrument [Line Items]
Debt, fair value	631.1	600.6
Fair Value | 5.00% Senior Notes
Debt Instrument [Line Items]
Debt, fair value	549.9	559.5
Fair Value | Real estate related
Debt Instrument [Line Items]
Debt, fair value	$ 81.2	$ 41.1